Causes:
Poor adhesion in galvanized metal is often caused by
improper surface preparation, the failure to apply a
primer before coating with an oil-based paint, and
material failures in sand baked-on enamel finishes or
glossy surfaces before painting.
Solution:
Remove any rust on metal with a wire brush.
Then, use an acrylic latex corrosion-resistant primer (one
coat is usually sufficient).
New or previously-painted galvanized metal should be
cleaned to remove all fabricating oils. It can then be
painted with a top quality acrylic latex paint without
applying a primer.
A metal primer should always be applied to unpainted
galvanized metal before applying an oil-based or vinyl
latex top coat. |
