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I don't know, this stuff dried hard, but pliable, not rubbery at all. I didn't put it in the engine compartment though. The Military used some sort of undercoating/sound deadner on the firewall of some Deuces I've seen, what did they use?

I'm still kind of leaning toward the "rubberized coatings" that are available. I've had excellent results with 3M Rubberized Undercoating. I have used this product on Deuce battery boxes after blasting them down to bare metal. In another application, I coated the exposed sheet metal under the...

What about a spray-on undercoating? It seems it would be more flexible than Rhino or Line-X, probably cheaper too.