Basically, the 1k paints/primers dry by evaporation of some solvent, the 2k has 2 parts mixed together which "dry" by chemically reacting & getting solid. The 2k is much tougher. Brian


My \'64\'s in the Gallery
Pictures in my Photobucket
1964 C10 Custom Cab 350/700R4
1964 Suburban 350/700R4
1979 Ford F350 4x4 400/c6