Glen, I've used Scalecoat paints (not Scalecoat II) for several diesels and a good number of passenger cars and I always thin it with lacquer thinner (Canadian Tire, about $10.00 a gallon
). You'll get a nice glossy finish, ready for decals, but be sure to let it dry completely: it takes longer than Floquil. I like to let it sit for at least a week, so that it hardens completely.
Wayne