Have anyone tried before:
http://www.hytechsales.com/prod150.html

Would like to know if it's worth giving the case interior a coat of this paint.

It says is sound dampening and has a little of insulation proprieties to, I dunno if that will help or get in the way as I plan to install a Phase Change unit inside the case.

Sounds like roll-on truck bed liner

$31.75 per gal......AAaaa no.

How about auto-body 'rubberised' underseal ?
http://www.autobarn.net/3munruunbl.html
Cheers
terminator

Great tip Ill try that one in my case. Will post results.

Thanks!