POOR GALVANISED METAL ADHESION:
Paint that has lost its adhesion to a galvanised metal substrate.

POSSIBLE CAUSES:
• Improper surface preparation, such as inadequate rust removal.

• Failure to apply a primer before application of a solvent-based or water-based paint (vinyl acetate copolymer type).

• 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 water-based corrosion-inhibitive primer should be applied (one coat is usually sufficient). Previously painted galvanised metal that is completely rust-free can be painted without applying a primer. New galvanised iron should be allowed to weather for at least 6 months or washed down with turpentine to remove any oil. A water-based metal primer should be applied to unpainted galvanised metal, followed by a top quality exterior acrylic water-based paint.

< Back