High-Gloss With sanding or bonding primer Requires heavy abrasion or adhesion promoter. This mechanical abrasion gives the liquid polyurethane something to bite into, ensuring a long-lasting bond that resists chipping.
Oil Based Polyurethane Over Paint: Essential Application Tips
Oil-based (Alkyd) Oil-based preferred Ensure paint is fully cured; test for compatibility. Latex paint is generally compatible with both water and oil-based polyurethanes, creating a flexible finish that moves with the substrate.
Dust, grease, or a layer of old wax will prevent the coating from adhering correctly, leading to a ruined finish. Consider using a bonding primer if you are working with high-gloss paint.
Oil Based Polyurethane Over Paint: Essential Tips and Prep Steps
Testing a small, inconspicuous area is always recommended to verify compatibility and drying behavior. Lightly sand the painted surface with 220-grit sandpaper to create a matte finish.
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