I was thinking that I would sound proof the inside of the cab. I sort of like the idea of the spray working as a moisture shield. I live in the lower mainland of BC and it's a rain forest climate. Hard to keep things dry here. I thought a mat could hold moisture underneath. Apparently you can spray it under places like your fenders. They said it can be sanded and painted.

A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired.
1948 Chevy 2-Ton