Southern Polyurethanes 4:1:1 Turbo 2K Primer uses a hyper-cure resin system that can be sanded in 30-40 minutes and is 100-percent shrink free and sand-scratch free in only three hours at 75°F. Turbo 2K Primer has excellent filling properties and sands great. Available in black, white or gray, it’s ideal for both high-dollar custom work and high-production body shops alike. Buy a gallon of Turbo 2K Primer and a quart of activator for about $140. The product is 50-state compliant. Visit www.southernpolyurethanes.com.