Preparing Galvanized Sheet Metal For Painting

Rinse the metal with a weak solution of water and ammonia and allow it to dry.

Preparing galvanized sheet metal for painting.

In addition to sspc sp 16 referenced earlier astm international has published standard practice d6386 10 standard practice for preparation of zinc hot dip galvanized coated iron and steel product and hardware surfaces for painting. If you have a kitchen then you probably already have this handy solution. 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. Once the metal has been cleaned and is dry prime it using an exterior multipurpose latex primer or a latex primer that is made specifically for galvanized metal.

There are documents available that describe methods of preparing surfaces of new and weathered hot dip galvanized steel for painting. A powerful degreaser will cut through dirt grime mold and other problematic residue without affecting the temperamental zinc coating. Rinse the metal and let it dry completely for several hours. Sand the entire.

Wipe the galvanized surface down with white vinegar. Common household products like comet mineral spirits and chlorine bleach can all be used to prepare galvanized steel for painting. Go over the metal with a wire brush to remove any oxidation. Additionally slightly different methods may be recommended according to the condition of the galvanized surface newly galvanized partially weathered galvanizing fully weathered galvanizing.

On older galvanized metal surfaces where the zinc coating has begun breaking down known as white rust use a wire brush or fine sandpaper to remove the chalky film before cleaning it. The secret to painting galvanized steel is white vinegar. Remove any handles or other attachments from the metal. How to prepare zinc coated galvanized sheet metal for painting so that the primer and paint sticks.

Here s how to paint galvanized metal. Just like painting over bare steel proper surface preparation is crucial to ensuring effective adhesion. Successfully painting hot dip galvanized steel also known as a duplex system does not have to be difficult or confusing. White vinegar is both effective and non toxic so it is much safer to use than your average industrial solvent.

Proceed in small sections until you ve cleaned the entire surface. All you have to do is simply apply the vinegar to a clean rag and then wipe down the galvanized surface.