But does get hard without it? Majic tractor paint has hardner too. Don't know if you Have to use the hardener like some paints..
PPG had an industrial Alkyd enamel you Had to use hardener or it would Never dry or be chemical proof. They were trying to remove VOCs', but you add a hardener with Isocyanates that is more dangerous!
Yes, the paint gets hard but will get harder with a hardener. That's where I'm at now - which paint and which hardener. I'm wanting a satin finish and have to be careful that the hardener doesn't make the paint " glossier " as some claim to do.