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.

Painting galvanized steel is a simple enough job but it does require some specific tools and materials. 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 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. 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.

Alkyd and oil based paints may seem to stick at first but the oily layer eventually sheds the paint. If crawling around on a metal roof in the hot sun does. The first sign that this is beginning to happen is a loss of the glossy look that new siding has. When this happens the metal is exposed to the elements and will start to eventually rust.

Some people use acrylic latex paint which is not designed specifically for galvanized metal so you will want to prime the surface before painting. Step 2 tackle rust. Inspect every crevice of the siding for the rust. Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal.

This in turn will help you to paint it easily. Paint that has lost its adhesion to a galvanized metal substrate e g. Go over the metal with a wire brush to remove any oxidation. Galvanized steel also requires special surface treatments before painting.

Steel rusts very quickly and this is the one common disadvantage of having steel siding. 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. It also helps to peel away the previous paint on the steel siding leaving it neat and clean. 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.

The surface that has been painted. Spray rust converter on each section you find. This is followed. Large cans may be the most cost effective option when painting large linear metal objects such as fences and backsplashes but spray paints e g rust oleum hammered metal finish spray 8 74.