Primes and levels all at once! As a primer it prevents bleed-through of fillers and as a surfacer fills minor pits. Won't shrink, sands easily (wet or dry), and is compatible with any top coat system. Easy spray-on application using your spray gun. Clear liquid hardener included. Requires.070 fluid nozzle and needle in standard spray gun or.051 in Accuspray HVLP Gun.