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notsew_evets(at)frontiern
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 Posted: Mon Oct 29, 2007 11:02 am Post subject: Painting |
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Questions about painting....
My fuselage came with zinc chromate primer and thats not a problem.
What I d like to know is this: The wings and tail are bare aluminum. What did you do to paint your aluminum ?
In the past I ve use Alodine and then painted. That seemed to work good. However the Auto paint store suggested to continue with zinc chromate. I really would like to keep the weight down and the labor less......
I dont recall if aircraft paint shops "prime before paint ??
Steve
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JAPhillipsGA(at)aol.com
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| Posted: Mon Oct 29, 2007 11:39 am Post subject: Painting |
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Steve, I can't advise you as to what's best. I can tell you that the Zinc C will bleed through paint. On my XL I used PPG two part epoxy primer (two light coats) and two coats of PPG single stage polyuithine. On the left wing bottom near the pitot tube bracket the ZC bled through all four coats. I cannot recommend you try to paint over the stuff, Course, if you do and it looks okay thats great, just what happened to me. Best regards, Bill of Georgia
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notsew_evets(at)frontiern
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| Posted: Mon Oct 29, 2007 12:04 pm Post subject: Painting |
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Thanks Bill
What I have done so far and that was recommended by the auto paint guy is this: I used a sealer/primer over the zinc chromate. The sealer is to stop bleeding thru of the ZC. I guess the auto paint guy is sharp on whats best. I did not want the expense of more ZC primer and want to not use it, period. I dont think aircraft paint shops use ZC always. They ( I think ) use Alodine as an etch and then paint. Thought I d ask here on the website.
Steve
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shilcom
Joined: 28 Sep 2007
Posts: 63
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| Posted: Tue Oct 30, 2007 3:39 am Post subject: Painting |
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I would continue to use a primer, but switch to self etching primers. Zinc Chromate can be effected by some modern epoxy and catalyzed eurathanes, so use caution. If you don't want to prime use the etches and alodines available. DuPont calls theirs Part A and Part B paint prep I believe, and just follow instructions. I've done Both. Bob U.
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