Surface Prep and Paint

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This page will primarily document Dave's experience with the surface prep and painting of "Black Beauty," his '73 SB.

All responses to questions are from Rob Boardman unless otherwise indicated.

Topics discussed in this article are as follows -

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Preliminary Thinking... Decision

Early on, Dave wrote -

Someday I’d like to strip this car down, remove all the rubber and the chrome and everything, and do a decent paint job. The paint job we have is very poor. When we get to that point, I plan to do most of the prep work myself -- I'd like to strip the car right down to the bare metal. I don't have enough confidence in my painting ability to do that part of the job myself -- I'll leave the actual painting to the pros. Bottom line -- I want to clean everything up nicely and give it a nice paint job so that when I put it all back together it will be way beautiful.

Rob wrote -

I'm toying with the idea of doing the painting myself, but I'd have to get the right gear -- I’ve only got a low pressure ('reverse vacuum cleaner') type of spray gun -- not quite up to auto-paint standards. And compressors are expensive to hire or buy. I should join up with one of the VW clubs -- sure to be some gear for loan out there someplace.

I have painted cars before with moderately good results, and would love to do it for the 'ownership' of the resto work, but I also want a great result, and this can be difficult for any vehicle which has had silicone polish used on it anytime in the past. This stuff soaks in to the paint and prevents a proper sticking of new top coats, despite several methods of coping with it. Much better to strip the paint down to bare metal and start again, but this adds another element -- getting all that paint off -- sand blasting or paint stripper = more work and expense. More cogitating necessary.

Dave wrote -

My wife and I have been talking, and I think we’ve decided we’re going to get the Bug painted right away. It’s a logical time to do it.

I already have one window out and two fenders off, so it would be smart to just remove the rest of the windows and the two rear fenders, then get the job done.

Dave wrote -

I'm very worried about the cost, though -- the kid across the street restored a beautiful rust-colored Ford Fairlane -- he did all the prep work himself, and the painting still cost $2500. I've gotta find a place that will do a good job for me for less than that. My wife says I oughta buy a spray gun and do it myself! I don't think so!

Rob responded -

It's really not that hard, but you DO need a still warm day (no dust), out of the direct sun, and be prepared to do it again if you get it wrong. (practicing on one fender is a good idea). I've painted cars on two occasions, both with little experience, but both came out looking OK. The second time was Bertie. Years later THAT paint started to peel and I found out THEN about anti-silicone etc :-(

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Cleaning/Painting Underside

Dave wrote -

I hope to be able to spend at least an hour tonight under the car. I've almost got the cleaning done -- what a job!

I went to the auto parts store at noon today and bought a spray can of corrosion-resistant paint -- I'm going to use that to paint the underside of the body and the deep inaccessible places. Painting is next on the list -- first the underside of the car, then the heater boxes and and muffler and associated stuff with heat-resistant paint (after thorough wire brushing). That will represent the turning point from tear-down to re-install.

Later -

This high-temperature paint is very slow drying. I put on two coats.

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Overspray/Masking

Dave wrote -

I'm sure I'm going to have to do a lot of sanding and paint touch-up when I remove the front and rear windows. I wish I could afford a new paint job, but ...

The other day I wire brushed the top of the engine lid in place, as there were a few chips and the old yellow paint was showing through. Then I carefully masked all along both sides of the joint (the one I've always complained about being too wide -- tho its narrower now) and painted the lip with spray paint. To my dismay, I discovered when I took off the masking tape it was too narrow (I thought 2" would be wide enough), and I got some overspray on the finish. I think I should be able to rub it out with some very fine rubbing compound, but I want to make sure I don't mess up even more, as I've put some fine scratches in the finish of this car with rubbing compound before. I've got to start getting real smart when it comes to body/finish work, as I have lots of it to do. Any suggestions?

Rob responded -

There's no easy solution once the paint has dried, but if the car had been polished previously the spotted paint won't stick very hard and could be carefully picked off spot by spot with a sharp knife or razor blade scraper.

I always use a two-strip method of masking. Us a strip of masking tape to get a fine edge (just as you've done) and them get newspaper and more masking tape, place the masking tape half over the edge of the newspaper and then stick it along the first layer of masking tape. Then use bits of masking tape to hold the opposite edge of the paper so it doesn't flap in your face when you are painting. Spray paint will drift quite a distance.

Rob wrote in response to a question about using masking tape on the new finish -

I've also seen special paint masking stuff in the hardware shops here -- soft stick -- but this is usually a fold out strip with sticky on one edge so it lays out from the skirting board on to the carpet etc you have a 3-4 inch anti-splash zone. Designed for use in the house really -- around windows and such. Probably not quite right for the car. I only mentioned it because it has a soft sticky strip which won't pull paint off. I learned finger trick with normal sticky tape when I used to make model aircraft, and used to paint them too of course - too much sticky would rip the tissue paper wing coverings.

Dave wrote -

Wow. If your "finger" trick will reduce the stickiness to the point that it won't rip tissue paper, it certainly should be okay for use over paint.

Rob responded -

The tissue paper had by that time been strengthened by several layers of model aircraft dope (cellulous dissolved in acetone), but yes -- you can just keep pulling it through your fingers until it just holds -- like the paste on a post-it note.

Dave wrote -

Right now the hood and engine lid and the rear apron replacement are started but not finished, as is the masking -- yesterday I covered the hood and the windshield opening with plastic. I found that I had to pull back the headliner from around the window opening, as the masking tape wouldn't stick to it. Wouldn't stick to the yellow paint under there either, so I had to sand it a bit. I'll have to reglue the headliner after the car is painted. (I've become very adept at using contact cement!)

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Surface Prep

Dave wrote -

It's looking more and more like I'm going to have to do all of the prep work myself. Having never prepared a car to be painted before (sanding, etc.), I'm just a bit apprehensive about this. I know I'm going to have to remove all of the windows and the rubber (all of which will be replaced). And I'll remove the fenders and the hood and I guess the rear bonnet.

Rob responded -

It's hard to advise about this, since the quality of the current paint is unknown. If it's in poor condition it might be better to take it off and start again, but it might be OK with just a good scuffing with 400 wet/dry or thereabouts so the new stuff will key properly.

You certainly won't need to take it back to base metal - the VW paint system was very good. But you have to make sure the paint guys use a paint that is fully compatible with the VW paint - enamel I think.

Dave wrote -

I really need to find a good book that explains exactly how to sand the car, what tools to use. I know that the prep work is by far the most important part of the refinishing process.

Rob responded -

You got that right -- it's about 90% of the job, and the coat of paint is the other 10%.

Dave asked -

Of course I will have to grind out the rust spots and prime them, and (as you say) give the existing VW paint a good scuffing so the new paint will adhere properly. So - what tool should I use? I have a disk for my drill that is designed for removal of paint. Will that be adequate for most areas, with exception of the rusted spots, of course?

Rob responded -

Should be OK. It will probably clean up the rust too, though sanding the metal with dull the paper fast.

Rob wrote -

I looked at a car mag at lunch time (brousing at the newsagent :-) They were using a special paint (forget what it was called but something like Prep-paint) in a contrasting colour to the primer -- to lightly cover an area, then block sand it (rubber block etc). Any hi-low spots show up in the shading, so then they refilled with a thin coat of filler, repainted with the pre-paint and sanded it again until ALL the prep-paint came off evenly. Each time using a finer paper - down to 400 I think. Then it was re-primed before the top coat went on. Four paint and sand operations before the top coat!

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Paint Stripper

Dave wrote regarding the use of methylene chloride as a stripping chemical -

My Merck Index says that methylene chloride is soluble in 50 parts of water, also miscible with alcohol and ether. Sax's "Dangerous Properties of Industrial Materials" adds that methylene chloride is soluble in water and miscible with alcohol, acetone, chloroform, ether, and carbon tetrachloride.

Rob responded -

The stuff I used on the veranda said that for plastic paints it worked best if mixed with a little water -- and it was miscible/soluble (turned slightly milky in appearance).

Bob Hoover said that when used as a carb cleaner it uses Kerosine as a carrier, and that it also dissolves in Diesel fuel. Your list doesn't include straight hydrocarbons (or is acetone in that category - I forget, but I don't thing so).

So does that mean as a carb cleaner is would be better to use acetone?

I have several litres of 99% Methyl Cloride left, and thought it might be worth using as a carb cleaner - my 30 year old carby has never had a deep immersion clean before, and I bet it would look like new.

Dave wrote -

The American Conference of Governmental Industrial Hygienists (ACGIH) lists methylene chloride as a suspected human carcinogen, and the Threshold Limit Value in air (above which it is dangerous to breath the stuff) is only 50 ppm. It is an eye and severe skin irritant.

Rob responded -

It certainly IS an irritant. I was standing well clear and using a long wand on the high pressure cleaner as I removed it (and the paint!) from the walls. A few spots on the back of the hands was enough to ensure I kept my distance :-) Used rubber gloves when painting it on the walls. Using it on cooler days proved better than warm days - it evaporated more slowly and so did a better job on the paint.

Dave reported on a little sample of "environmentally-friendly" paint remover -

I smeared a little of it on the top of the car about an hour ago -- it hasn't done anything yet. I let it work overnight -- It did very little.

BOTTOM LINE on paint removers: Methylene Chloride is clearly the paint remover of choice for stripping the paint from a VW body. However, Methylene Chloride is very nasty and must be used with appropriate personal protective equipment. Read and follow the label instructions!

Dave wrote -

I went after the right rear fender with methylene chloride. The paint remover route is the ONLY way to go! It certainly works well on car, with the kind of paint that was used on it before. The old paint is very thick and very hard and brittle.

Stripped Fender

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Dave wrote -

I'm going to completely cover all of the window and door openings before I start stripping the body in earnest -- I sure don't want any of the stripper getting inside the car! I find that it tends to bleach things that it comes in contact with.

Stripped Bug

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Grinding

Rob asked about the grinder discs -

Do the discs clog up easily, or does is just turn to dust and fly away?

Dave responded -

For the areas to which I needed to add bondo I used a 120-grit sanding wheel on the grinder. Unlike the sandpaper that I use on my sanding blocks (and by hand), the sanding wheel doesn't clog up very readily. It's made up of a whole bunch of overlapping pieces of sandpaper. But it does create a lot of dust.

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Old Paint

Dave wrote regarding the black paint that was then on his car -

It's VERY poor. In places like the inside of the door jams it peels off in chunks -- it's almost like a thin layer of plastic.

Rob responded -

The previous paint hasn't been keyed properly, and the new paint probably was not treated with "anti-silicone" to cope with the polish on the old paint (silcone polish can be a real problem I'm told).

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Bondo

Dave asked -

A question for you -- I've run into some "Bondo" under the paint, and I know I will find more. Do I need to dig/sand all of this out and start over, or can I just sand it down and apply a finish coat of Bondo and then sand it nice and smooth? This is my first Bondo experience.

Rob responded -

If it's in good condition -- no cracking and no lifting, just leave it and resurface/sand as necessary. If you need to resurface with a skin of new bondo, use a courser grade sandpaper to score the old surface for good adhesion.

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Air Vents

Dave had a particularly hard time stripping out the paint inside the rear air vents, above the hood lid. You will note his frustration -

I STILL don't have all the paint out of there, and I'll bet I've spend four hours on that job alone! I'm gettin' sick of this! :-)

Someone asked -

This is my first attempt at restoring a Beetle. I am ready for painting now. How in the world do you prep the area behind the louvers above the engine. No one has fingers that small?

Response -

Yes, it's area difficult are to get to. The sand blasting used on Dave's is probably as good as you'll get. I've also heard restorers say that the "internal panel with the slots can be removed by drilling out the spot welds, then the area can be fully restored before re-welding the panel back in. Sounds like a LOT of work to me though!

Note: This was a very difficult area for Dave, too. He primarily used the small steel cleaning bushes (a bit larger than a toothbrush) coated with the methylene chloride-base stripper, but even these were too large. Dave had some success cutting the brush down a bit, but he never was as successful as he would have liked in getting this area clean. Lots of patience, and lots of elbow grease, unless you have access to a sandblaster with a very small nozzle.

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Fender Undercoat

Dave wrote -

I got some "Paintable Rubber Undercoating" in a spray can (what WON'T they think of next! :-) that I'm going to use to undercoat the new front fenders, since they are only primed.

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Paint Notes

Dave found a recommendation regarding paint -

Use a high-quality paint, like Spies-Hecker two-stage base coat/clear coat ...

Rob wrote -

I've heard this stuff is good (don't even know if it's available here) and can be had in genuine VW colours. John Henry mentions this paint.

Dave wrote -

I stopped by their paint supplier and picked out the paint -- it will be a 1999 BMW color called "Cosmos Black Metallic" -- really beautiful -- black with tiny blue flecks.

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The Doors

Dave asked -

But what about the doors? I know I'll need to take the panels on the inside off, but what about the doors themselves? I worry about painting the hinges.

Rob responded -

The doors are easy enough to remove (once you can unstick those large Phillips Head screws!) and would make it easier to paint, but you might be better off checking on this with the paint places.

Dave wrote -

Tonight I'm going to clean/sand/paint down inside the window openings in the doors where the felt channels and scrapers go. Then I'm wondering what you think -- should I reinstall door latch mechanisms and the window channels (clip in on the rear side of the window, felt channel fits in) and regulators before I have the car painted?

Rob responded -

Better to have the door stripped totally for the painting. Means there's less masking, and less chance of bad edges. It will look a lot more "professional" to your critical eye to have no overspray etc on the mechanism and so on.

The only thing is that once it's painted you'll have to take care not to scratch it whilst reassembling the door -- but you'd be taking care anyway.

Doors Removed

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Progress continued -

During lunch today I'm going to apply some more paint remover to the right door. I hope to get all of the paint off of it before day's end, then I will spent tomorrow sanding and filling and sanding and sanding and sanding...

The Driver's Side Door - Ready to Prime

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The Driver's Side Door - Primed

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Progress, continued -

At about 2pm, no matter where I am (!), I'm going to quit and take the doors to the shop. There's only so much fun a guy can stand! :-)

The hood is next. I know that there's been a lot of repair to the front of it - I'm going to be very careful there so as not to damage the existing filler too much. I think I will try to just sand the paint off in that area, as the paint remover tends to soften the filler and damage it. . .

I started working on the doors at 7 o'clock this morning, and I finally got them to the shop at 5pm!

The Doors

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Rob wrote -

What a great job - those doors look clean enough to eat off!

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Interior Protection

Dave asked -

And then my biggest worry -- how best to protect the interior during all of this?

Rob responded -

Yes -- a good question. I guess it would be best to mask off/seal the whole interior, but once again, the paint shops could advise you on this.

I was delighted to find a donor body with a suitable colour (either white or blue was my choice and it's white) so I don’t have to try and change the interior paint colour if I decide to repaint the outside.

Dave wrote -

I am as concerned about keeping the mess from the sanding, etc. out of the interior of the car as I am keeping the overspray out. The black interior will show the dirt and overspray very clearly.

I suppose it may be a good idea to put in the new dash cover while I have the windshield (windscreen :-) out -- I think it would be MUCH easier.

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Dave's Progress

Dave reported his progress with his painting project -

By the end of the day tomorrow I should have the car completely torn down and ready to have the paint removed. I'm sure glad I'm doing this -- I'm finding yellow paint under the black everywhere...

Dave wrote -

Tomorrow I'm FINALLY going to begin removing the black paint in earnest. I'm going to start with the rear fenders.

A progress report -

I just got off the phone with the manager of the paint shop over in Pasco where I took the fenders. He said I did a pretty good job of surface prep on the fenders...

I worked some more on paint removal last night. I'm working on the driver's side door. I've got the inside of the door all stripped down (around the window and the center part that I finished off previously and now have covered with masking tape and plastic). I started on the outside surface of the door last night, but didn't get very far before I got tuckered out and quit.

That black paint is REALLY hard to get off -- required three stripper coats in some cases.

Progress, continued -

I worked to the nose of the hood with #80 grit sandpaper) this afternoon and got a surprising amount done in an hour or so. I wanted to define the limits of the bondo ­- didn’t outline all of it, but I found the extent of in, anyway. Not too bad, except for one little area on the lower left where it’s cracked and will have to be replaced.

It’s really interesting to sand down through the layers. From the metal up, there are two coats of primer, then the original VW topcoat (cream color on this part of the car).

Then a coat of black directly over the cream -­ followed later by bondo where necessary directly over the black, then a coat of primer, then a second black coat (undoubtedly applied later), and a clear coat. It’s no wonder I’m having a hard time getting the paint off! . . .

Rob responded -

I'll say -- it's got quite a history! And the black/bondo/primer/black says it's had a hit after it was painted black the first time.

Progress, continued -

I came home a little early this afternoon and got a couple of hours in on the Bug. I'm making good progress on stripping the hood.

Man, there's a lot of paint on that car! It's a good thing I'm doing the prep work, as arduous as it is - I'm sure the shop would charge me an arm and a leg if they had to do it!

I'm having a problem deciding just where the inside/outside interface should be.

Rob responded -

I can understand that -- it was one of the reasons I decided to keep my current body white rather than paint it the light sky blue (60 colour) I would really like -- just too expensive for me to have to paint the interior too.

Dave continued -

It's the door frames that I'm unsure about -- like the surface of the frame where the interior light switch is on either side. It wraps all the way around into the car - I'm not sure I want to go that far.

As soon as I get the steering wheel hub painted and the rear apron replaced, I'll be going after the main part of the car big time -- and it won't be long before I'll be able to show you a picture of Black Beauty without the black!

Note: Dave installed a tow bar on his Bug and towed the car to the paint shop behind his Little Red Truck. See the picture below.

Off to the Paint Shop

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Progress, continued -

I'm getting more and more excited about seeing the car roll out of the paint shop! The shop is doing the final touches on the body work -- they are going to sandblast the air intake vents on the back of the car with a small sandblaster. I did SO much work on the body -- probably got it 90% there or so; now the pros are going to make it perfect. The car is going to be SO gorgeous!

Anyway, the paint shop guy said that they are going to "shoot" (i.e., paint) the car with the color and clear coats on Tuesday or Wednesday of next week.

BUT -- they have the old fenders cleaned up and stripped, and the antenna well is now WELDED in place! They also got the holes in the top of the fenders where the turn signals were filled with round pieces of metal, welded in place. So MUCH better quality than before. . .

The car is going into the paint booth TODAY! "How exciting!"

The manager of the paint shop took me into the shop to look at the fenders and doors and hood and stuff. I just can't describe to you how gorgeous they look! Beautiful, shiny black, with tiny, tiny blue flecks when you look at them obliquely. Nine coats altogether.

(The following Spring) Black Beauty has been returned to the paint shop!! I asked the guy there to go over her with a fine-toothed comb, and he promised me that he would.

Out of the Paint Shop for the Last Time!

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Rob wrote -

What a top looking Bug! The blue fleck just shows up in the pic - outstanding.

I can well imagine you turning a few heads driving that home. And just in time for your son - what a buzz he'll get (and you too!)

Congratulations on a great job!

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Curing

Dave wrote -

The Bug is really looking great -- even though I can see it still needs a polish (after a cure period), it looks so even and mat-shiny it's obvious it will look outstanding when finished.

Rob wrote -

If he said it needs to cure first I think he must be a "real" paint specialist - so many would give it a quick buff a day or two after the paint and call it complete - a year or two later you'd be wondering why it was looking very dull.

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Conclusion

Dave wrote -

The experience that I NEVER want to repeat is the removal of SIX layers of paint! And then all the Bondo and sanding -- not exactly what I'd want to do for a living! I got it about 90%, then let the paint shop finish it up. I was MIGHTY sick of it by then, believe me! I wish I had all the $$ I spent on methylene chloride in my bank account!

I took my son over to the paint shop and introduced him to the proprietor and showed him the place where his car was worked on. There is a chip on the hood now, probably a rock ding or something -- I had the paint shop guy look the car over and give me an off-the-top estimate to repair everything -- $250! Sounds a bit steep to me! I'm going to see if I can get a bottle of touch-up paint and fix it myself.

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Disclaimer stuff: Rob and Dave have prepared this information from their own experiences. We have not assumed any specialised mechanical knowledge, but we DO assume that anyone using this information has at least some basic mechanical ability.

We hope you find this information useful, but we don't take any responsibility for anything which happens to you, other people, your VW or any other property or goods resulting from your use of this material.

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Have fun fixing your VW - just keep them fweeming, OK?

Last revised 6 May 2004.

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