Painting Galvanised Sheet Metal

Rinse the metal and let it dry completely for several hours.

Painting galvanised sheet metal.

Prime the surface with a primer made for metal. 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. Wash the metal thoroughly with hot soapy water. All you have to do is simply apply the vinegar to a clean rag and then wipe down the galvanized surface.

The enamels in alkyd paints can react with the slick zinc finish on a galvanized steel surface leading to poor adhesion and peeling. The secret to painting galvanized steel is white vinegar. Galvanized steel is coated with a thin layer of oil and passivator that protects it from water and weather damage. White vinegar is both effective and non toxic so it is much safer to use than your average industrial solvent.

The vinegar is a mild acid which acts to etch the galvanized coating so the paint will stick. Preparation of galvanized steel before painting. You first are advised to prepare the surface of the item to be painted so that the paint for galvanized metal stands its best chance of looking good for several years. Paint applied over this oily surface or clear passivator will peel quickly.

T wash etch primers sweep blasting and weathering. Here s how to paint galvanized metal. Rinse the metal with a weak solution of water and ammonia and allow it to dry. Avoid using alkyd based paints such as spray paint on galvanized steel.

For the most dependable results look for paints that are formulated specifically to bond to galvanized steel. Wipe the galvanized surface down with white vinegar. Go over the metal with a wire brush to remove any oxidation. There are four recognised methods of surface pre treatment that produce a sound substrate for a paint coating.

Metals depot stocks many sizes in precut sizes full mill sizes or we can hot dip virtually any. Remove any handles or other attachments from the 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. The following is a quick introduction for the process.

That s great for preventing rust but it also prevents solid paint adhesion. Painting galvanised metal is very easy as long as the right steps are carried out.