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Selecting
the Right Application Equipment |
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For a consistent, long-lasting finish, you need to apply paint and coatings with high-quality application equipment. Better-quality brushes, rollers, and applicators tend to apply a thicker, more uniform, longer-lasting coat of paint than paint applied with cheap equipment. Top-quality equipment also speeds up and simplifies your work. The tools you require will depend on the type of project you are doing and the type of paint you are applying. Still, some simple guidelines hold true for any quality paint job.
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Types
of Brushes When applying any type of latex coating, use only brushes with synthetic bristles. No matter how much water they are exposed to, they hold their shape and maintain proper stiffness. Top quality polyester brushes are well worth the initial cost. When properly cleaned and stored, they will continue to apply paint smoothly and uniformly for years to come. |
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Which
Brushes Do You Need? Match the right brush to the job to get the best paint application possible. For large exterior surfaces, use a 4"-wide (100mm) flat brush with a thickness of 3/4" to 1" (25mm to 3mm). To cut in at the corners of exterior and interior walls, use a 2"-wide (50mm) brush with tapered edges. For exterior and interior woodwork and molding, use brushes between 1" (3Omm) and 2 1/2" (60mm) wide. For precise painting of exterior and
interior window frames and trim, use angled sash brushes between 1"
(30mm) and 2 1/2" (60mm) wide. |
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Selecting
a Quality Brush In addition, tug on the bristles before
you purchase a brush. If more than one or two bristles can be pulled out,
the brush is probably poorly constructed. Finally, make sure the brush
feels comfortable in your hand. If a brush is well made and well cared
for, it will last for years, so make sure you can use it comfortably. |
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Selecting
Paint Rollers Caption: (rollers, right): Rollers come in various widths and nap lengths. Selecting the proper nap length for the surface to be covered will ensure an even finish. However, rollers are difficult to work
with in small or narrow spaces, so you'll probably need to buy several
different sizes of rollers, and one or more paintbrushes. An important consideration when selecting
a roller cover is the length of the nap. In general, you should paint
smooth surfaces with short-nap rollers, and rough surfaces with long-nap
rollers. When applying gloss or semi-gloss paints, short nap covers tend
to generate less foam during paint application. Recommended nap lengths
for some common surfaces are as follows: As with brushes, it is wise to purchase better-quality roller covers, even though they may cost a more initially. High-quality roller covers apply paint more easily and are less likely to leave nap fibers on the painted surface. While price is a good indicator of quality, you can also test the quality of a roller cover by squeezing it. A high-quality cover will quickly return to its original shape. Also be sure the roller cover has no obvious seams, since these tend to leave streaks when you apply the paint. Standard roller widths are 7 1/2" and 9" (190mm and 240mm). The 9" (240mm) size is suitable for most interior wall and ceiling jobs. Mini-rollers, about 3" (75mm) wide, are convenient for painting trim and narrow areas. Paint Pads Most paint pads are made of foam or mohair, and can he used to apply both latex and oil-based or alkyd paints. In most cases, the pads can be replaced when worn or damaged. Paint Sprayers Conventional sprayers use compressed air as the pressurizing agent to deliver the paint. Airless sprayers, pump the paint directly. Achieving proper coverage with conventional sprayers can be tricky business, but accomplished do-it-yourselfers can get good results with airless sprayers. Hand-carry electric airless sprayers are a good choice for interior painting; larger, wheel-around gasoline or electric units are better suited for extensive exterior work. As with all power equipment, be sure to follow the manufacturer's instructions for setup and operation. Most important, never point an airless sprayer at any person or pet because the pressure of the spray is strong enough to inject paint into the bloodstream, which can be harmful or even fatal. Finally, when doing exterior painting, avoid working on windy days. |
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Copyright Sudprasert Engineering (C)2002
10 February, 2003