Apply a primer to.
Paint rusty metal barn roof.
This will remove flaking rust and as much of the surface rust as.
Wait a full 24 hours for the roof to dry.
How to prepare a rusted galvanized metal roof for painting step 1.
Hand or power tool clean the rusty metal to remove any flaky rust and unsound paint.
Wash the galvanized metal using a pressure washer.
Treat any flash rust by rubbing paint thinner onto the surface.
Let the roof dry out thoroughly before applying noxyde coating.
To paint a rusty metal shed you ll need to sand away the rust apply a special primer then paint it.
The black tip provides enough pressure to clean without stripping the existing paint.
The first thing you ll need to do is wash your shed with warm soapy water.
Access the rusted galvanized metal roof using an extension ladder.
You can also use oil based alkyd paint but.
Painting a rusted metal roof step 1.
Begin with the roof and use the power washer with the tsp solution to thoroughly clean the pole barn in 8 foot by 8 foot sections.
Dirt can increase rust so this way you start with a good foundation.
Insert the black tip on the power washer wand.
Combine 1 1 2 cups tsp for every 5 gallons of hot water.
Scrub the rust away using a stiff wire brush.
Water blast clean the prepared surface to remove all remaining dust and contaminants leaving a clean dry surface.
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.