Preparing Sheet Metal For Painting

Start with a wire brush photo 1.

Preparing sheet metal for painting.

The vinegar is a mild acid which acts to etch the galvanized coating so the paint will stick. If the old paint is in poor condition you can remove it by hand wire brushing sanding. Once done you can paint over rust. If you need to paint inside choose a well ventilated area and consider using a respirator.

With the rust removed sand the entire surface to smooth out uneven areas and dull the surface so the primer and paint can adhere. The vinegar s acidity will further abrade. Wipe the galvanized surface down with white vinegar. This will remove any dust and dirt from the surface of the sheet metal.

Sanding and applying primer. Remove loose and peeling paint. No matter what the material it s hard to apply a proper coat of paint if you re brushing over bits and particles. The goal is to remove any dust dirt or other particulate buildup that could affect the texture of the metal surface.

Spray the metal with compressed air. Some metals are pre coated with an oil that is designed to. If you haven t already spread out a drop cloth or a large plastic sheet. Scrub partially rusted metal areas with a wire brush to remove flakes and powdery surface rust then prime with a rust inhibitive primer.

Paint will not adhere to dirty oily surfaces. For large flat surfaces use a sanding block to get even pressure. To properly prepare new metal surfaces use mineral spirits to remove grease and apply a. Introduce your secret weapon the secret to painting galvanized steel is white vinegar.

Preferably set up your painting area outside. Go over the metal with a wire brush to remove any oxidation. Prime the surface with a primer made for metal. Place the object you re painting on a drop cloth.

Start with 120 grit sandpaper and work to finer grade sandpapers ending with 320 grit. Spray the sheet metal with white vinegar and wipe it down with a clean rag. Things you ll need chemical degreaser distilled white vinegar lint free cloth high grit sandpaper or wire brush exterior latex primer exterior latex paint paintbrush or roller rubber gloves.