What is the substrate? (Use the appropriate primer for the given substrate: wood, steel, aluminum, brick, etc.).Listed below are some factors to consider when selecting the most appropriate primer. To help with choosing the appropriate primer, certain factors must be considered. However, the performance properties may not always satisfy the task at hand. Many manufacturers do offer a "universal" primer/sealer/stain-killer with broad performance capabilities. Not really, that's why there are so many primers on the market. Is there one single primer that will work in all applications? cover fire damage, water spotting, or other bleed-through problems). Act as a barrier coat for substrates (e.g.oil/alkyd over galvanized steel or epoxies over alkyds). Act as a barrier coat for topcoats (e.g.hard, glossy surfaces such as aluminum, copper or plastic). Allow adhesion to non-porous substrates (e.g.Seal off knots and sap streaks in wood.Seal porous surfaces like weathered wood or masonry, sheet rock or plaster.Provide a uniform texture or gives "tooth" for adhesion of subsequent coats.Provide uniform porosity resulting in a smooth, even topcoat for consistent appearance.What are some of the functions that a primer performs? A primer's main functions are to limit absorption of paint into the surface (seal) and to provide good adhesion (bond). All new surfaces and most of the repaired surfaces require priming before the topcoat is applied.
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