Metal: Choose a rust-resistant oil-based primer on metals such as aluminum to avoid the formation of rust, which the water in latex primer can promote.Painted wood: An oil-based primer is usually best for painted wood that shows chalking (a chalky powder on the surface as the paint binder degrades) or chipping it will dry into a denser, smoother foundation to minimize these imperfections.Choose an oil-based stain-blocking primer if the stain is water-based (e.g., water-based wood stain, smoke, or tannin).Choose latex stain-blocking primer if the stains are solvent-based (e.g., crayons or grease).It will cover stains and keep them from bleeding into and discoloring top coats. Stain-prone surfaces: Use a stain-blocking primer on stained wood, bare wood with high tannin content that can bleed out (e.g., cedar or redwood), interior walls with water or smoke stains, or cabinets/trim with grease stains.Drywall: Apply a latex primer to drywall, as an oil-based primer can raise the grain and make the surface look uneven. Keep in mind that oil-based primers tend to emit more VOCs (smelly pollutants) than do latex primers.
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