Painting Galvanised Sheet Metal

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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 metal is very easy as long as the right steps are carried out. 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. 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. Remove any handles or other attachments from the metal. Galvanized steel is coated with a thin layer of oil and passivator that protects it from water and weather damage. Paint applied over this oily surface or clear passivator will peel quickly.

Here s how to paint galvanized metal. 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. Go over the metal with a wire brush to remove any oxidation.

The following is a quick introduction for the process. Rinse the metal and let it dry completely for several hours. Avoid using alkyd based paints such as spray paint on galvanized steel. Bituminous latex acrylic and vinyl paints tend to adhere well to galvanized metals.

White vinegar is both effective and non toxic so it is much safer to use than your average industrial solvent. Wipe the galvanized surface down with white vinegar. Preparation of galvanized steel before painting. How to paint galvanized metal.

T wash etch primers sweep blasting and weathering. That s great for preventing rust but it also prevents solid paint adhesion. The secret to painting galvanized steel is white vinegar. For the most dependable results look for paints that are formulated specifically to bond to galvanized steel.

Rinse the metal with a weak solution of water and ammonia and allow it to dry. Metals depot stocks many sizes in precut sizes full mill sizes or we can hot dip virtually any.