Get ready for the final coat on new parts or auto body repairs with this gray or black 2K primer and activator combination. High-build urethane primer is a versatile surfacer that can be applied over bare metal, body filler, epoxy primer, existing paint and much more. Since it is a sandable primer and fills imperfections as you spray, it’s great if you want to get an older surface perfectly smooth. This 2K primer is available in grey or black and comes in either quarts or gallons for grey and gallons only for black. This 2K primer activates with with part# 6501-4 at a 4:1 mix ratio, so you get a half pint of activator with a quart of primer and a quart of activator with a gallon of primer. Activator is included with purchase of primer.