Latex primer cures into a relatively low surface energy, plastic-like film that is flexible and moisture-breathable. Traditional oil-based paints, being solvent-borne and rigid, do not bond well to this slick surface.
Avoiding Common Mistakes with Oil Latex Painting: Primer and Paint Bonding Tips
An oil-based primer, such as a stain-blocker or shellac-based primer, will bond perfectly with the underlying surface and provide an excellent key for the final oil-based finish. If you have the flexibility to choose or re-prime, selecting a bonding primer specifically designed to accept oil-based paints is ideal.
Although this adds a step to the project, it eliminates the risk of adhesion issues and ensures a durable, professional-grade finish that will withstand time and environmental stress. This process, known as deglossing or keying, involves lightly sanding the entire primed surface with fine-grit sandpaper, typically 220 grit.
Avoiding Adhesion Issues with Oil Latex Painting
Without proper preparation, the paint film lacks a mechanical grip, leading to adhesion failure. Final Considerations and Longevity.
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