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Posted by NickySantoro on April 8, 2007, 5:35 pm
On 8 Apr 2007 11:23:48 -0700, "limeylew@gmail.com"
>I just bought a new turbine (just the top, not the base) to replace an
>ailing one.
>
>It came with the galvanized finish, which was fine with me, as they
>didn't have a black one and I also bought a can of flat black
>Rustoleum, so I could make it match the others on the roof.
>
>However, as I looked through the directions on the Rustoleum can, I
>saw that it said to DON'T use on a galvanized surface.
>
>I know I have painted EMT with this type of paint in the past and not
>had any trouble with it.
>
>SO, my question is, do you know why they would have this warning?
>
>Is it because Rustoleum doesn't adhere well to a galvanized surface,
>or is it because it would create a toxic gas, or what?
>
>Lewis.
>
>*****
It's about adhesion to galvanized. If you etch the turbine with acetic
acid or white vinegar, then rinse and dry, you should be OK. I've done
that many times with galvanized ductwork and been ok.
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