This Lightweight Body Filler is a two component compound used to fill dents, gouges, and other cosmetic imperfections in Steel, Aluminum, SMC, and Fiberglass panels. Designed for use with an air-operated dispenser. Tack-free in 15 to 20 minutes. Creamy texture for an easy smooth spread. It resists loading sandpaper, so sanding is easier and you use less abrasives. Gallon.