Can I paint latex over oil-based paint?

Short answer

Yes, but not directly. Clean the surface, scuff sand it to dull the gloss, and apply a bonding primer rated for oil-based surfaces. Then use latex over it. Latex applied straight over oil tends to peel off in sheets.

How to tell if old paint is oil

Rub a small spot with a cotton ball soaked in rubbing alcohol. If paint comes off on the cotton, it's latex. If nothing happens, it's likely oil-based. Trim and doors in older homes very often are.

Steps

Degrease and rinse.
Sand with 120 to 150 grit until the shine is gone.
Wipe off dust.
Apply a bonding primer.
Topcoat with latex enamel.

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Updated September 2026. Always follow the directions on your product's label; manufacturer instructions come first.