Like the title says, "what is hardener in the paint for? Reason that I ask is because five years ago when the "friend" painted JD's custom '83 S10 (350 SBC, TH350), he left the hardener out even though we paid for the paint AND hardener! His "excuse" was that if he put hardener in the paint that he wouldn't be able to use it again! The paint chips easily. Just bumping into it will knock a chip into the paint. Is this because it doesn't have harnener in it? JD is just sick about it as he paid $3000 for the paint job. He and I both feel that we need to strip the dime down to bare metal and start from scratch.