On a side note, I've never had an issue with POR-15 not holding up, but then I always top-coated it with something. The best results I ever got was on my '73 LeMans frame while doing a body-off resto'. Blasted frame to bare metal and after prepping it for paint, sprayed it with POR-15 (had to cut it with thinner to get it to flow out of the gun) then when it was still tacky, topped it with Dupont Chroma-One in gloss black. That stuff was like Kryptonite on Superman and held up well for years. This was done in the early 90's so maybe things have changed since.
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Just a blind squirrel looking for a nut.
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