Anybody have experience mixing in Hy-Tech Thermal Solutions ceramic paint additive (Insulating Paint Additive Makes Paint Insulate ) to knock down the radient heat from the firewall and floorboards? Says it will work with any paint. A package for 1 gallon of paint is $11.95 which is considerably cheaper than getting something like Lizard Skin. Thinking about getting some and adding it to some rustoleum to paint the floor/trans hump/firewall of the 40.