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Main paint problem list

Exterior problem
Poor Galvanized Metal Adhesion

Poor Galvanized Metal Adhesion: Paint that has lost its adhesion to a galvanized metal substrate.

Possible Cause:

Improper surface preparation, such as inadequate rust removal.

Failure to apply a primer before application of an oil-based or vinyl latex paint.

Failure to sand baked-on enamel finishes or glossy surfaces before painting.

Solution: Any rust on the metal should be removed with a wire brush; then, an acrylic latex corrosion-resistant primer should be applied (one coat is usually sufficient). New or previously painted galvanized metal that is completely rust-free can be painted with a top quality acrylic latex paint without applying a primer; however, a metal primer should always be applied to unpainted galvanized metal before applying an oil-based or vinyl latex top coat.