You require a shellac-based primer or a high-adhesion bonding primer. Oil-based paints cure into a smooth, almost plastic-like surface that lacks the tooth or texture necessary for new paint to grip effectively.
Latex Paint Over Oil Adhesion Promoter: Essential Tips for a Secure Bond
Oil-based coatings create a hard, non-porous finish that repels water, making it difficult for the water-based latex to bond securely. Lightly sand the surface with fine-grit sandpaper to break the gloss and create texture.
These issues will telegraph through the new latex layer if not properly contained. This mismatch can create stress within the layers, causing cracks to appear as the underlying film moves.
Latex Paint Over Oil Adhesion Promoter: Essential Tips for Bonding</answer_end>
Staining and Spot Priming If you are dealing with water stains, smoke damage, or tannin bleed from wood, a specialized stain-blocking primer is essential. Without the correct process, the new layer is prone to peeling, flaking, and premature failure, leading to a waste of time and resources.
More About Latex paint over oil based paint
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