How to prep and paint a metal roof?

So I need to do some work on my roof. The previous owner hired someone to paint the roof not long ago and apparently they did a terrible job. The paint never adhered and there are large portions of roof without paint. I would like some information on how to remove the old stuff, prep the surface and then paint it. This will help me decide to spend a weekend doing it or hiring someone else.

Asked By: Adam D - 4/15/2008
Best Answer - Chosen by Asker
There are a lot of variables at play here such as the shape of the roofing material (corrugated vs. flat sheets), composition (aluminum vs. tin), levels of existing corrosion and oxidation, and just how well the last paint adhered where its not coming off... More
Answered By: tboward - 4/15/2008
Additional Answers (4)
First you need to remove the rest of the old paint. If part has been peeling that means the rest is not far behind... More
Answered By: cheezyhill - 4/15/2008
Pressure wash and rinse. Spray on a good primer and good oil based paint. I wouldn't use any latex just doesn't stick to metal.
Answered By: extex_cop - 4/15/2008
I would suggest power washing with a detergent solution in the power washer and then rinsing without detergent. You can wash and scrape by hand but a power washer will be faster and more effective... More
Answered By: BRP - 4/15/2008
I paint a few metal roofs each year. Scrape off any peeling paint and sand rusted areas to remove flaking rust. You do not have to sand down to shiny bare metal. Prime rusted spots with an oil base primer and finish with a good acrylic paint. There are DTM (direct to metal) acrylic paints available. These should not be... More
Answered By: winterrules - 4/15/2008
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