How To Paint Metal Roof Rust

You can also use oil based alkyd paint but you need to first apply an undercoat of a galvanized metal primer such as sherwin williams pro industrial pro cryl universal acrylic primer.

How to paint metal roof rust.

Start by preparing the surface by scuffing it with 80 120 grit sandpaper or wire brushes which will help the paint adhere better. Hand or power tool clean the rusty metal to remove any flaky rust and unsound paint. How to prepare a rusted galvanized metal roof for painting step 1. Painting a rusted metal roof step 1.

Invest in a rust inhibiting metal spray paint and spray primer. Purchase products that are labeled for metal and contain a zinc additive. Instructions on how to paint over rust. Wash the metal roof using trisodium phosphate in water at a ratio of 1 cup tsp per 1 gallon water.

Apply a primer to. Scrape rust from the roof using a wire. Access the rusted galvanized metal roof using an extension ladder. Water blast clean the prepared surface to remove all remaining dust and contaminants leaving a clean dry surface.

This will remove flaking rust and as much of the surface rust as. Use a special oxidizing primer on the roof which will help inhibit the growth of rust in the future. Wait a full 24 hours for the roof to dry. Zinc helps prevent rust from developing in the future.

Scrub the rust away using a stiff wire brush. Wash the galvanized metal using a pressure washer.