Yes the Killrust takes ages to dry. When I worked at a Case IH tractor dealership, the trick was to use a hot air gun to speed up the drying time. However, you have to be very careful not to overheat the paint as it will bubble. I've also used the Killrust Matt black, which dries quickly. However, it is probably too dull a finish for what you want.

This is Killrust Matt black on a door top from my ex Army Land Rover. [Linked Image]
[Linked Image]