sprayed on in liquid form, oven cured, then polished in a fine abrasive media agitator for 2 hours. "Cerma Krome" is designed to "contain" the heat of hot exhaust gases up to 1600 degrees F. to maintain lower under hood temps. In place of heat shields, I think it looks pretty good too. I may use this on my intake plenum and water pipes too. Thanks for asking