He took a laser thermometer to the engine side firewall and measured over 130 degrees Fahrenheit, then measured the interior side of the firewall and got 90. He left the pickup, with the Arizona sun shining on the engine compartment side. I know of a guy that used this product on the interior side of the firewall on a old Chevy pickup project he was doing. You can apply it with a paint gun (large nozzle) or with a roller/brush. It is non-toxic, low volatile and water based. Cost was $85 shipped from the Space Coast to the FL/GA border/coast. I ordered a 1 gallon container of the product, which should cover 100 square feet. They sell just the spheres, 1, 5, and 55 gallon pre-mixed units of the product.

They also sell the premixed product for application. Knowing that the important ingredient of the Lizard Skin is ceramic micro spheres, I found a company on the Space Coast that sells the spheres. The problem with that product is the price is nearly $150 a gallon. Added bonus of the ceramic micro spheres is they deflect heat. Very similar to stuff used in aircraft applications. It is some form of paint mixed with ceramic micro balls. I then found a product called Lizard Skin. Problems with those products is the weight they add, and the price. I had originally considered using Dynamat, or its cheaper and not as good competition aluminum foil backed sheets of whatever. I am getting the opportunity soon, as I am getting a hack job floor pan repair. I've been wanting to put some sound deadener in my Monte Carlo for some time now.

Lizard skin sound control