Painting Galvanised Sheet Metal

Paint applied over this oily surface or clear passivator will peel quickly.

Painting galvanised sheet metal.

Galvanized steel is coated with a thin layer of oil and passivator that protects it from water and weather damage. 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. 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. The secret to painting galvanized steel is white vinegar. Wash the metal thoroughly with hot soapy water. If you have a kitchen then you probably already have this handy solution.

Avoid using alkyd based paints such as spray paint on galvanized steel. The vinegar is a mild acid which acts to etch the galvanized coating so the paint will stick. T wash etch primers sweep blasting and weathering. 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.

Metals depot stocks many sizes in precut sizes full mill sizes or we can hot dip virtually any. The following is a quick introduction for the process. How to paint galvanized metal. That s great for preventing rust but it also prevents solid paint adhesion.

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. Here s how to paint galvanized metal. Prime the surface with a primer made for metal.

There are four recognised methods of surface pre treatment that produce a sound substrate for a paint coating. 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 with a weak solution of water and ammonia and allow it to dry. Remove any handles or other attachments from the metal.

Go over the metal with a wire brush to remove any oxidation. Bituminous latex acrylic and vinyl paints tend to adhere well to galvanized metals.