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Paint Incompatibility

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Old wood with blue- and brown-colored paints showing wear and chipping

Paint incompatibility can cause loss of adhesion where many old coats of alkyd or oil-based paint receive a latex topcoat.

What Causes It?
When water-based latex is painted over more than three or four coats of old alkyd or oil-based paint, the old paint may "lift off" the substrate.

How to Solve It
Repaint the surface using another coat of alkyd or oil-based paint. Alternatively, you can completely remove the existing paint and prepare the surface—cleaning, sanding, and spot-priming where necessary—before repainting with a top-quality latex exterior paint.

Note: Images provided by The Rohm & Hass Paint Quality Institute.

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