Ask the Expert Question-and-Answer Archive

by Ron Joseph

October, 2004

Painting a Tin Roof

Q. We have a tin roof that is badly rusted. The roof itself is fine though. We want to paint it, but were told that anything we did- the rust would just bleed through. Do you know of a sealer that will keep the rust from bleeding through the paint? And what type of paint should we use over the primer?

Following is our generic response for painting or repainting a Tin or Metal Roof.

First and foremost you must clean and prepare the surface of the metal by removing all loose paint, rust, dirt, oil, and grease. After cleaning the surface, Sand or abrade any remaining paint with sand paper or a wire brush. Wash the surface clean again, and remove all sanding dust.

Typically a corrosion resistant primer would be applied to the metal roof, followed by a compatible top coat. Consult with your local paint supplier, ask for specific recommendations for a compatible primer and top coat system to use for this application.

When preparing any surface for the application of paints or coatings, be certain to take precautions to protect against breathing in any air borne dust or debris that may be created by the prep work.

Please be aware that paints, coatings and solvents are chemicals and therefore you should always pay attention to proper handling procedures and be prepared to wear protective clothing, such as respirators, gloves, coveralls, etc. For further information on the health and safety requirements for the coatings and solvents you wish to use we strongly advised you to contact your local coating supplier. If possible, go the extra step and look for this information on the website of the
product vendor.

Regards,

Jim Burke