Quality, multi-purpose acrylic hardener for 2K primer fillers, clearcoats, etc. Based on high quality isocyanate and filled with nitrogen to extend the shelf life. Hardener for use with 9900 M9 Surfacer, 7100 M10 2K Sealer, 9050 X5 HS Clear Coat, 9040 HS Clear Coat, 9410 X41 Matt.