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| Surface Preparation Guide | |
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Introduction
The quality of surface preparation, and surface repair on new, or repainted surfaces, significantly affects the amount of preparatory work that will be required for all subsequent repaints. Surface preparation and surface repair are the most important requirements for maximum durability from any paint system. Because the results of surface preparation and repair are quickly concealed by the first coat of paint, the effects are not usually evident until premature paint failure occurs.
The first step should always be a thorough examination of the surface to be painted, checking for peeling and faded paint, dirt, chalking, grease, cracking, knots, bare areas, mildew, rust, nail stains and structural problems. All surfaces, whether painted or unpainted, must be clean, free from shine, sound and dry prior to finishing.
General Surface Preparation
Loose and Peeling Paint
Remove as much loose and peeling paint by scraping, wire brush or power washing the surface.
Feather-sand rough edges smooth until they blend with bare surface.
Dirt, Grease, Oil, Chalk and Under-Eave Deposits
Remove these deposits by washing with a detergent solution (TSP) or commercial cleaner recommended for cleaning painted surfaces using a sponge or brush. Protected areas, such as under eaves and overhangs, need special attention to remove invisible deposits that can promote a premature peeling problem. After washing, thoroughly rinse with clean water and allow to dry. Power-washing is also a fast, effective method of removing dirt, chalk, etc. If a power-washer is used, follow the manufacturer's recommendations and warnings.
Mildew
Spotty patches that look like dirt, but do not come off when scrubbed with detergent solution, are probably mildew. Mildew can occur on any side of the house, but is more likely to grow in shaded areas or behind shrubbery. It can easily be identified from other forms of discoloration by applying a few drops of bleach. If mildew is present, the black, gray or brown color will bleach out and disappear within one or two minutes. Mildew must be killed and removed before repainting. If the mildew is not completely removed, the active spores will continue to grow and may almost immediately begin to reappear on a recently repainted surface. Where mildew is present, apply a solution of one part household bleach and three parts water, or use a commercial mildew killer. | |
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