Painting Galvanised Sheet Metal

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Painting galvanised sheet metal.

Paint applied over this oily surface or clear passivator will peel quickly. 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. That s great for preventing rust but it also prevents solid paint adhesion.

Prime the surface with a primer made for metal. Rinse the metal with a weak solution of water and ammonia and allow it to dry. The vinegar is a mild acid which acts to etch the galvanized coating so the paint will stick. 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.

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

Here s how to paint galvanized metal. The following is a quick introduction for the process. Go over the metal with a wire brush to remove any oxidation. Rinse the metal and let it dry completely for several hours.

Galvanized steel is coated with a thin layer of oil and passivator that protects it from water and weather damage. There are four recognised methods of surface pre treatment that produce a sound substrate for a paint coating. Remove any handles or other attachments from the metal. The enamels in alkyd paints can react with the slick zinc finish on a galvanized steel surface leading to poor adhesion and peeling.

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. Bituminous latex acrylic and vinyl paints tend to adhere well to galvanized metals. All you have to do is simply apply the vinegar to a clean rag and then wipe down the galvanized surface. Wipe the galvanized surface down with white vinegar.

Metals depot stocks many sizes in precut sizes full mill sizes or we can hot dip virtually any. For the most dependable results look for paints that are formulated specifically to bond to galvanized steel.