Maria, I used self-adhesive 1/8" thick neoprene sponge and applied thick thermal barrier foil on top of that (which I converted to self-adhesive). I did this because it was less expensive (for me, anyway) and because I knew it would work. Any sound deadening product will do one of 2 things...it will either slow down the sound waves or it will block sound (which interestingly turns the sound wave vibrations into a wee bit of heat energy. That's why sound deadening pads use foil or shiny aluminum...to catch the sound and reflect the heat waves backward. Please don't worry. It won't generate enough heat to affect the temp of your cab. It is more of an engineering thing than anything else. Friends of mine have used many types of products and they tell me the only difference is in cost. You can pay more...or you can pay less, but the products all work about the same. Good luck. Oh, one other thing: you do not have to cover the entire panel. If you cover half or so, you might get about the same effect.
