The basecoat was then decanted from the bucket using one of the smaller mixing cups supplied by Summit, into the largest. These are all marked with various mixing ratios, making it a snap to add the correct amount of reducer. The Summit basecoat is mixed 2:1 with reducer. Basecoat doesn’t need an activator. I mixed enough at a time to fill the spray gun twice, which was needed to apply a single coat to the truck.