The short answer is yes, but success depends on proper preparation, the type of paint used, and the formulation of the polyurethane. Consider using a bonding primer if you are working with high-gloss paint.
Polyurethane Over Paint Application Tips
High-Gloss With sanding or bonding primer Requires heavy abrasion or adhesion promoter. The process requires cleaning the surface with a degreaser, lightly sanding with fine-grit sandpaper to dull the sheen, and removing all dust with a tack cloth.
Wipe away all sanding dust with a damp cloth followed by a tack cloth. Paint Type Recommended Polyurethane Notes Latex (Water-based) Water-based or Oil-based Flexible and generally compatible with both types.
Polyurethane Over Paint Application Tips
This mechanical abrasion gives the liquid polyurethane something to bite into, ensuring a long-lasting bond that resists chipping. Compatibility with Paint Types You must consider the type of paint already on the substrate before applying polyurethane.
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