MAXX FILL 2K High Build Urethane Primer Surfacer with Activator - Light Grey (1 Gal.) Mixing Ratio: 4:1:1 1.5mm - 2.2mmm for Conventional and HVLP guns 35-45 psi at the gun for Conventional gun 28-35 psi at the gun for HVLP gun Film Build : 3.0 mils wet, Pot Life: 3 hours, VOC: 4.4 lbs/gallon (RTS)