You need to use paint that is both for metal and for outdoor use as it will usually contain a metal protector.
How to spray paint a tin roof.
Apply a coat of paint to the entire roof.
Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal.
Again work from your ladder as much as possible.
Here s how to make sure you make the right calls while addin.
Wash the brush or roller you used for the primer or get a new one.
Carefully overlap the layer you applied previously until the tin roof is fully painted.
Apply the first coat using a paint sprayer in slow even passes for the entire length of the roof.
When spraying a roof with water based acrylic paint at least a 017 inch spray tip preferably of the reversible type should be fitted.
If crawling around on a metal roof in.
If you happen to have an airless spray.