Painting metal roof


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Old 04-18-10, 09:08 AM
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Painting metal roof

I have an old (probably 70 years or so) 20x60 shed. It has a metal roof that is sound but has surface rust.

I need to coat it this year... I am not going to scrape it (much too big) but I just want to apply a coating.

Should I use something like Rustoleum rusty metal primer then paint... or a roof coating like Henrys?

thanks.
 
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Old 04-18-10, 10:40 AM
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I'm not sure if I know what Henry's is is it a fibered aluminum roof coating? If so, it can be applied without a primer although primer would make for a better job.

Regular aluminum paint must have a primer as it won't hold back rust - it will bleed thru the a paint. Roof paints would also need a solvent based primer.

You mentioned scraping - is there paint on the roof? or just rust?
It wouldn't hurt to run sandpaper over it although I can understand not wanting to go crazy with the sanding. A quick sand using 80 grit on a drywall sanding pole shouldn't be a big job and would be beneficial.
 
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Old 04-18-10, 03:44 PM
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Thanks

Just about all of the paint is gone, there is now just surface rust. Good idea about using a rough sandpaper on a pole, I could do that.

I am thinking of using Rustoleum Rusty Metal primer, then a good Rustoleum topcoat.
 
 

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