Painting A Rusty Galvanized Metal Roof

Wash the galvanized metal using a pressure washer.

Painting a rusty galvanized metal roof.

Wash the metal roof using trisodium phosphate in water at a ratio of 1 cup tsp per 1 gallon water. Instructions on how to paint over rust. After you ve sanded away the rust apply 2 coats of a rust inhibiting primer to prevent rust building up underneath the paint. Link to product info on amazon first might be a good idea.

A power washer may remove more of the rust for you. Then apply 2 coats of a water based enamel acrylic paint to bring out the color. You can wash it by hand using a sprayer attachment to a garden hose or a power washer. You can also use oil based alkyd paint but.

Painted metal roofs come with a baked on factory finish and you can re coat these as well as paint bare metal roofing with acrylic latex paint. All you have to do is simply apply the vinegar to a clean rag and then wipe down the galvanized surface. Wait for the roof to dry completely before proceeding. How to prepare a rusted galvanized metal roof for painting step 1.

The acidity of the vinegar will react with the metal treating the surface to promote paint adhesion. If it s quite old and rusty any primer for metal followed by any outdoor paint designed for metal is probably okay although a rust converter affil. Allow the first coat to dry completely before applying a second coat. If it s a newer roof the galvanizing can definitely cause you adhesion problems.

Scrape rust from the roof using a wire. Water blast clean the prepared surface to remove all remaining dust and contaminants leaving a clean dry surface. Wait a full 24 hours for the roof to dry. Choose a type of paint you may or may not need to prime the surface depending on the type of paint you choose.

After noxyde is applied.