Talk about a bunch of haters. Sheesh. Have I painted a guitar using bedliner? No. Have I painted a guitar, whereas it affected the tone? Yes. Have I painted a bedliner with that stuff? Yes. And I know that the stuff is dense, and deadens noise. Why? Because if it's density and consistency. It cut down on the VIBRATIONS. And that's what it's gonna do to a guitar. Someone painted a pedalboard with it, and liked it: Great. You don't count on the tonal resonance of your pedalboard, for your sound.
Hey, if he wants to try it, let him try it. Hell, why don't you guys try it. I was trying to help the guy out, and you jump on ME with such attitudes? So WHAT if I haven't painted a guitar with it. I know what the properties of the stuff are, and it's not what I would want on my guitar. Maybe YOU do.