This mechanical abrasion gives the liquid polyurethane something to bite into, ensuring a long-lasting bond that resists chipping. Therefore, the key is to create a mechanical bond by roughening the surface or using specific adhesion promoters to allow the polyurethane to grip securely.
Applying Polyurethane Over Painted Kitchen Cabinets for Lasting Protection
Choosing the Right Type of Polyurethane Not all polyurethanes are created equal when applied over paint, and selecting the correct formula is essential for the project's longevity. Lightly sand the painted surface with 220-grit sandpaper to create a matte finish.
If the paint film is too smooth or glossy, the polyurethane may peel or bubble, particularly in high-humidity areas. 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.
Polyurethane Over Paint Kitchen Cabinets: Preparation and Application Tips
Applying polyurethane over paint is a common question among DIY enthusiasts and professional contractors looking to protect interior surfaces. Paint Type Recommended Polyurethane Notes Latex (Water-based) Water-based or Oil-based Flexible and generally compatible with both types.
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