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. High-Gloss With sanding or bonding primer Requires heavy abrasion or adhesion promoter.
Why Polyurethane Over Paint Might Peel and How to Prevent It
Dust, grease, or a layer of old wax will prevent the coating from adhering correctly, leading to a ruined finish. This mechanical abrasion gives the liquid polyurethane something to bite into, ensuring a long-lasting bond that resists chipping.
Testing a small, inconspicuous area is always recommended to verify compatibility and drying behavior. Wipe away all sanding dust with a damp cloth followed by a tack cloth.
Why Polyurethane Over Paint Might Peel and How to Prevent It
Consider using a bonding primer if you are working with high-gloss paint. Oil-based paint, however, requires careful consideration; since it cures slowly, applying a fast-drying water-based polyurethane on top can cause wrinkling or bubbling.
More About Can polyurethane be used over paint
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