How To Spray Paint Galvanized Sheet Metal

Paint that has lost its adhesion to a galvanized metal substrate e g.

How to spray paint galvanized sheet metal.

Alkyd and oil based paints may seem to stick at first but the oily layer eventually sheds the paint. Once the metal has dried dampen a cloth with white vinegar and wipe the surface down. The problem with painting galvanised metal is that the surface when new is very shiny and smooth making it difficult for paint to stick to the surface. Avoid using alkyd based paints such as spray paint on galvanized steel.

Galvanized metal is difficult to paint because it s coated with a layer of oil to prevent white rust. The surface that has been painted. Galvanized steel is a great material to use for a variety of tools products and projects and it s environmentally friendly. It also has surface contaminants oils greases residues etc left on the surface from the manufacturing process that interfere with the adhesion of paints.

Possible cause 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. The choices of paint for galvanized metal will depend upon both the application and service environment. When painting galvanized steel all paint systems used should be specifically formulated for use on galvanized steel and applied in accordance with the paint manufacturer s recommendations. The enamels in alkyd paints can react with the slick zinc finish on a galvanized steel surface leading to poor adhesion and peeling.

In fact roughly 69 of steel is recycled in north america each year. For the most dependable results look for paints that are formulated specifically to bond to galvanized steel.