Scrape rust from the roof using a wire brush.
How to paint zinc roof.
Wash the galvanized metal using a pressure washer.
Coat the zinc plated metal with galvanized metal etching primer using a roller and a shed free roller cover.
Brush vertically applying slight pressure.
Roll one three by three foot section at a time.
Finish coatings once you have applied your sealer to your zinc or aluminium coated steel roof zincalume then you can apply your two coats of with roofbond roof paint.
If it is a new factory painted roof then you will need to apply a coat of apply shieldcoat s shieldseal w plus to the roof prior to applying you finish coats.
Wash the brush or roller you used for the primer or get a new one.
Terne metal roofs are extremely long lasting but because they look very similar to galvanized metal a person can unknowingly invite problems if they use the wrong paint.
How to prepare a rusted galvanized metal roof for painting.
Access the rusted galvanized metal roof using an extension ladder.
Again work from your ladder as much as possible.
Apply a coat of paint to the entire roof.
Wait a full 24 hours for the roof to dry.
Stop and smooth the wet etching primer using a polyester paintbrush.
Terne is best painted with an oil based paint.