Painting Galvanized Metal Siding

Galvanized metal is difficult to paint because it s coated with a layer of oil to prevent white rust.

Painting galvanized metal siding.

It also helps to peel away the previous paint on the steel siding leaving it neat and clean. Paints that are made for galvanized surfaces will require less prep work and will adhere better than other kinds of paint. When this happens the metal is exposed to the elements and will start to eventually rust. This in turn will help you to paint it easily.

Galvanized steel is less prone to rust since it has a special zinc coating which needs to be thoroughly cleaned and roughened so that the primer paint will adhere to it properly. Steel rusts very quickly and this is the one common disadvantage of having steel siding. 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. This is followed.

If you re attempting to paint siding panels roof flashing or other materials that have seen exposure to the elements a thorough cleaning is necessary to eliminate any organic contaminants from the outer. Pre finished metal siding is siding that has already been painted and while this coating lasts a long time it will eventually erode away. Galvanized steel also requires special surface treatments before painting. Spray rust converter on each section you find.

Paint that has lost its adhesion to a galvanized metal substrate e g. The first sign that this is beginning to happen is a loss of the glossy look that new siding has. If crawling around on a metal roof in the hot sun does. Go over the metal with a wire brush to remove any oxidation.

The surface that has been painted. Some people use acrylic latex paint which is not designed specifically for galvanized metal so you will want to prime the surface before painting. Inspect every crevice of the siding for the rust. Do not use alkyd based paints or oil based primer.

Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal. Alkyd and oil based paints may seem to stick at first but the oily layer eventually sheds the paint. Common household products like comet mineral spirits and chlorine bleach can all be used to prepare galvanized steel for painting. Before painting galvanized metal such as drip strips around eaves or roof flashing take the following steps so the paint will adhere properly and not peel.