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Old 05-09-2008, 09:50 PM
william r plise's Avatar
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30 coupe

Well now Im bummed. I spent two days wire brushing every crack and cranny, new welds, and every seam then I went and got some PPG dx579 metal cleaner and cleaned every inch of the coupe. according to the guy's at the paint store you are supposed to wash it off with water right away. I did and the dang car rusted on the spot. What the heck. Is this what is supposed to happen? Do I need to clean it again or just epoxy primer right over it? Pops

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Old 05-09-2008, 10:29 PM
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I make sure that the metal is sanded good and the n would clean it good with a solvent based precleaner to get any contaminates off and shoot the epoxy. Metal conditioners i feel do more harm than good. JMO Tim
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Old 05-09-2008, 10:56 PM
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cleaning metal.....

HI,i always clean the metal (after ive sanded it good) with phosphoric acid (HOME DEPOT) then wire brush off the residue,and apply at least 2 coats of epoxy primer. never had a problem later with rust.
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Old 05-10-2008, 06:52 AM
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If the metal is sanded good, cleaned with a water borne wax and grease remover, there is no need for a metal conditioner of any type. As far as I am concerned, they are just a way for the manufacturers to make money. A quality epoxy primer doesn't need metal conditioner applied for it to work.

Aaron
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Old 05-10-2008, 08:47 AM
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Quote:
Originally Posted by william r plise
Well now Im bummed. I spent two days wire brushing every crack and cranny, new welds, and every seam then I went and got some PPG dx579 metal cleaner and cleaned every inch of the coupe. according to the guy's at the paint store you are supposed to wash it off with water right away. I did and the dang car rusted on the spot. What the heck. Is this what is supposed to happen? Do I need to clean it again or just epoxy primer right over it? Pops
Usually if there's some flash rusting it will remove easily with just a red/maroon scothcbrite. If you're using any kind of 2K primer Epoxy or any form of DTM urethane or epoxy hybrid the metal will need to be textured will before it's applied. A good 80-180 grit scratch works well. A quality epoxy gets my vote for the sturdiest foundation and anti corrosion primer. Self etch primers don't require any texture. Neither should be applied over a phospheric prepared surface-these metal preps were designed for use under lacquer primer. I do use some phospheric acids (naval Jelly and also a product made by Kleenstrip) to remove corrosion but when I'm done it gets rinsed with water and before priming I sand to clean bare metal. Works for me.
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