I was using an undercoat gun for the first 10 gallons that I sprayed...then I went classy and bought the Lizard Skin spray gun...wow was it ever neat.....sprays much faster. The quart container sprays for about 1.5 to 2 minutes before it is empty. If you spray a lot, you can attach a hose from the gun to the bucket and suck directly. We do the inside and outside of process ovens....lets them heat up faster and keeps the heat inside. Stuff is fantastic. WE buy it from Hot Rods and Custom Stuff in Escondido (1-800-HOT-ROD-5). We used blue 3M tape to mask the area, pull tape off and you have a nice clean line.