listing
Painting your exterior
Poor Galvanised Metal Adehsion
Paint that has lost its adhesion to a galvanised metal substrate.
POSSIBLE CAUSES
1. Improper surface preparation, such as inadequate rust removal.
2. Failure to apply a primer before application of a solvent based or water based paint, vinyl acetate copolymer type.
3. 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.
Paint that has lost its adhesion to a galvanised metal substrate.
POSSIBLE CAUSES
1. Improper surface preparation, such as inadequate rust removal.
2. Failure to apply a primer before application of a solvent based or water based paint, vinyl acetate copolymer type.
3. 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.