Wait a full 24 hours for the roof to dry.
How to paint zinc roof.
How to prepare a rusted galvanized metal roof for painting.
Coat the zinc plated metal with galvanized metal etching primer using a roller and a shed free roller cover.
Terne is best painted with an oil based paint.
Access the rusted galvanized metal roof using an extension ladder.
Apply a coat of paint to the entire roof.
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.
Scrape rust from the roof using a wire brush.
Roll one three by three foot section at a time.
Brush vertically applying slight pressure.
Wash the brush or roller you used for the primer or get a new one.
Again work from your ladder as much as possible.
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.
Galvanized roofs require the use of a different paint than what is used on terne metal.
Allow the zinc plating to dry for three hours.
Wash the galvanized metal using a pressure washer.