On a related topic, can
acrylic 2-pack paint be used on aircraft (i.e. is it avgas splash resistant, etc) and if so can it be applied on top of polyurethane paint?
I have a car paint shop about 1 minute's walk away which does clear lacquer every day, and would be dead handy for small components, but they use acrylic.
A couple of years ago I touched up a few spots with an aerosol from Halfords
and without exception all the areas showed massive shrinkage (cracking) of the paint. Underneath was the standard zinc chromate primer. But the cracking did not start for about a year. What would cause this? Could it be low temperature exposure e.g. -30C? Those areas have since been resprayed with the 2-pack Mapaero paint anyway.