Al's Liner ALS-HNR (HNR) Heat and Noise Reducer, Sound Control Ceramic Insulation, Audio Noise Insulation, Sound Deadener for Cars and Trucks - 1 Gallon Blocks up to 35% of exterior heat/solar energy from transferring through substrate Only requires 31 mils (31/1000 of an inch) wet coat to achieve maximum heat reflection- Covers up to 44 Sq. Ft. per gallon Provide incredible insulation, heat reflection and sound deadening properties Can withstand up to 500F and reflects exterior temperatures by 45F or more Can be applied with spray guns, brushes, and rollers- Cleanup is easy, just add soap and water