I think you can go both ways, but I brushed my stuff. Lays down well if you use a fine brush. Did the calipers with their caliper paint to handle the heat. Por 15 satin color matched the powder coat satin real close. Did the exhaust system in black satin ceramic coating, which matched the other coatings also. It will be pretty boring under there, but it should hold up will when I am off roading.