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Exterior paintExterior paint application consists of a substrate (wood, composite, plastic, or metal) that is first covered with a primer over which a colored topcoat is applied for decorative and protective functions, as shown in the figure below.`However priming step is sometimes skipped and topcoat is applied directly above previously applied topcoat.`Historically, alkyd or alkyd based primers have been used for applications.`With regard to the ever changing environmental regulations, other technologies are now replacing the conventional alkyd primers.`For the topcoat solutions, multiple technology based resin solutions with pigments and colors are used for topcoat.
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