Painting Galvanised Sheet Metal

Galvanized steel sheet plates are intended for use where greater corrosion protection is required without painting a lower cost alternative to stainless steel galvanized sheet and plates have a rust free protection for up to 30 years while maintaining strength with a durable surface coating.

Painting galvanised sheet metal.

Painting galvanised metal is very easy as long as the right steps are carried out. How to paint galvanized metal. White vinegar is both effective and non toxic so it is much safer to use than your average industrial solvent. Preparation of galvanized steel before painting.

That s great for preventing rust but it also prevents solid paint adhesion. Wash the metal thoroughly with hot soapy water. Bituminous latex acrylic and vinyl paints tend to adhere well to galvanized metals. If you have a kitchen then you probably already have this handy solution.

Remove any handles or other attachments from the metal. Rinse the metal with a weak solution of water and ammonia and allow it to dry. Galvanized steel is coated with a thin layer of oil and passivator that protects it from water and weather damage. The vinegar is a mild acid which acts to etch the galvanized coating so the paint will stick.

New galvanized metal a product used to make corrugated sheets gutters and downspouts is usually smooth and is coated with either a layer of oil to prevent white rust or is passivated. Rinse the metal and let it dry completely for several hours. The enamels in alkyd paints can react with the slick zinc finish on a galvanized steel surface leading to poor adhesion and peeling. There are four recognised methods of surface pre treatment that produce a sound substrate for a paint coating.

Prime the surface with a primer made for metal. The following is a quick introduction for the process. Go over the metal with a wire brush to remove any oxidation. T wash etch primers sweep blasting and weathering.

Avoid using alkyd based paints such as spray paint on galvanized steel. Paint applied over this oily surface or clear passivator will peel quickly. Metals depot stocks many sizes in precut sizes full mill sizes or we can hot dip virtually any. Wipe the galvanized surface down with white vinegar.

For the most dependable results look for paints that are formulated specifically to bond to galvanized steel. The secret to painting galvanized steel is white vinegar.