Just a word of caution- - - - -"hardener" additives are "cyano-acrylate" compounds (yes, that "cyano" means cyanide) and the vapors can be absorbed through the skin. If you choose to use them, wear a full-coverage disposable "shoot suit" and breathe filtered air from a source outside the paint booth. Lots of professional painters got severe, permanent nerve damage from exposure to hardeners a couple of decades ago, before the hazards of using the stuff were fully understood.
I taught collision repair and painting in a big high school vocational department for a while, about the time all those hazards were being discovered.
Jerry
