By shooting 4:1 with hardener, the coating behaves like a spray filler which can be used for either spot repairs or panel repairs. With the addition of 1 part reducer, 4:1:1, the primer can be used as a urethane surface for panel and overall repairs. Adding hardener then 2 parts of reducer, 4:1:2, turns this primer into a fast drying, non sand, wet on wet primer sealer. Tintable with up to 10 percent urethane mixing base. Can be applied direct to metal. Excellent build and surface leveling properties.