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CNKS
12-24-2007 17:42:16
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Re: Small primered parts - coating until I paint? in reply to Scott Rukke, 12-24-2007 14:20:47
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On cast, to be safe, do not use etch primer. Cast is porus, and it could cause damage after you paint. Actually there is no reason to use etch primer on anything but new sheet metal, this is done by body shops who do not want to take the time to sand. Not a good idea to use Picklex 20 or similar products on cast for the same reason, although I have done it with no ill effects. But, I don't do it any more. Best to use epoxy primer--unlike other primers, it is waterproof. Most epoxies have a 3-7 day window before they must be painted. Otherwise, you just scuff with a scotchbrite pad and apply another coat after that time before you topcoat. Epoxy primer adheres as good or better than etch anyway, provided you have prepared the metal. Preparation is done by the blasting, sanding, or wire wheeling that you do anyway, so there is no legitimate reason for etch. If you don't want to use epoxy, just let them set, and remove any rust before you paint. I live in a dry climate, (most of the time), I just leave bare metal inside (sometimes for months)I get very little rust. Those that say you "must" paint the same day as blasting or cleaning are either overreacting or live in a lot more humid climate than I do or cannot protect their parts.
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