Try talking to Jawel Paints in Stirchley, Birmingham. What they don't know about modern paints, both single part and two part is not worth knowing. They do excellent colour matching (Send them a sample of the colour painted onto the inside of a slice of a coke can), will advise on techniques and methods and will sell small quantities for touch up.
Paints changed dramatically some years ago in the UK due to the problems with CFC's, health (Isocyanate) and European legislation.
Most car body shops low heat bake the work, if your doing touch up on your aircraft then its best with a two pack paint Isocyanate based paint with the correct hardner for air cure temperatures. It will not be touched by oil, fuel etc.