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CNKS
08-05-2005 05:56:27
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Re: Original Paint process and priming in reply to BPNT, 08-04-2005 21:45:30
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Looking at the spec sheets for Alk and Aue, PPG does not specifically say that primer has to be used. It essentially says that it needs to be sanded and that for better results, chemically treated, I assume that means etched. It does, however, list recommended primers. One thing not mentioned, is that for a quality finish, you need to put a sandable surfacer or primer surfacer under the topcoat, the adhereance to bare metal of some of those is not too good, so epoxy should be used under them. Perhaps on cast coated with alkyd a primer is not necessary, but I imagine it is desirable. Some of the primers listed for Alk are epoxy primers, I did not look up all of them. One thing that I have noticed about tractor repaints -- I have chemically stripped a couple of fairly "decent" looking tractors that were likely painted with alkyd enamel, with no primer under the repaint, and no primer under the factory paint. The repaint strips very easily, the underlying factory paint gives much more resistance. So primer or not proper surface preparation is critical. As easy as epoxy primer is to use, I see no reason not to use it, no matter what goes over the top of it.
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