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Old 07-16-2012, 05:13 PM   #1
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Painting Residential Steel Siding


We are getting ready to paint our siding. It is steel (magnets stick to it) 8", with wood grain. Powerwashing removed a lot of old paint down to what I think is bare metal with some old paint remaining. It's now revealing a gray undercoat color. Is this galvanized or simply the factory primer? I can scratch at the siding with a key (that's just what I had at the time I was thinking about it) and a smooth shinny metal is revealed behind it. If i'm looking at primer is another primer necessary? And if it's galvanized? Would zinseer 123 be appropriate regardless of whether it's galvanized or primer that is now exposed? Paint stores have not been very helpful so i'm turning to the pros. I appreciate the help.

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Old 07-16-2012, 05:49 PM   #2
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Painting Residential Steel Siding


Wash the substrate with tsp or simialr. Remove all loose, peeling and flaking paint. Sand-wire brush any rusted areas. Prime bare and any rusted areas with Sherwin Williams Kem Bond high solids oil primer and then apply 2 coats of Sherwin Williams Acrylic DTM whether its steel or galvanized these products will work. I don't use zinnser, so I can't speak for that product.

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Old 07-16-2012, 08:32 PM   #3
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Painting Residential Steel Siding


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Originally Posted by housepaintingny View Post
Wash the substrate with tsp or simialr. Remove all loose, peeling and flaking paint. Sand-wire brush any rusted areas. Prime bare and any rusted areas with Sherwin Williams Kem Bond high solids oil primer and then apply 2 coats of Sherwin Williams Acrylic DTM whether its steel or galvanized these products will work. I don't use zinnser, so I can't speak for that product.
If this is galvanied metal, I would avoid using an oil based primer. Oil on galvanized surfaces will saponify and lose adhesion. A safe alternative would be to use Sherwin Williams Pro-Cryl primer with a DTM top coat. Pro-Cryl can be used on a variety of metal substraights with minimal surface prep such as power wash and hand tool cleaning with a wire brush to remove any loose rust (does not need to be bare metal). Spot prime any rust areas and allow to dry then a full prime coat followed by two coats of DTM acrylic and be sure to follow recoat times between coats.

Last edited by mustangmike3789; 07-16-2012 at 08:40 PM.
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