Latex paint is generally compatible with both water and oil-based polyurethanes, creating a flexible finish that moves with the substrate. 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.
Polyurethane Over Paint Spray Application: Surface Prep & Best Practices
Wipe away all sanding dust with a damp cloth followed by a tack cloth. If the paint film is too smooth or glossy, the polyurethane may peel or bubble, particularly in high-humidity areas.
Surface Preparation is Critical Skipping preparation is the most frequent cause of failure when finishing painted surfaces with polyurethane. Water-based polyurethane dries quickly, emits fewer fumes, and remains clear over time, making it ideal for light-colored interiors.
Polyurethane Over Paint Spray Application: Surface Prep and Technique
High-Gloss With sanding or bonding primer Requires heavy abrasion or adhesion promoter. 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.
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