U-Pol Products 2251 System 2025 DTM 2K Hs Urethane Primer Filler - 1 Liter the coating behaves like a spray filler which can be used for either spot repairs or panel 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 By shooting 4:1 with hardener