Dustspeck the MouseBoat
Building Dustspeck
And once it's smooth, you're ready to paint.  I put two coats of epoxy resin on my hull as a sealant before painting....  
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After you get your boat stitched and glued together and the epoxy and fiberglass hardens, you have to sand it all smooth. 
The epoxy looks nice but it breaks down in sunlight so you have to cover it with something for U/V protection.
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Next:  Surprise Launch!