Hey,
I used Chassis Saver on my '42. Great stuff as far as I can tell so far. I only put it on last summer, so I can't speak directly to the durability, but the guy at the paint supply place said he's been using it for years and that it's great.
I can tell you that the drips of the stuff that I dropped on cement are still there despite my best efforts to remove them, and probably will be for a long time. The stuff is absolutely rock hard once it cures.
-Jon
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