..... the paint issue plagues me too. It seemed more prevalent with my gas cars (on-road gas, touring) .Have either of you tried using 1000 grit (really fine) sand paper,then washing the body just before painting? -It does sound crazy ,I know. And also, due to cold winters [here], i've heated both the Poly carbonate body and the can-of-paint that i'm using just before and also during painting. An inexpensive hair dryer [on hot setting] to warm the plastic
body and hot water to warm the spray can.-I've used a hair dryer as opposed to a heat gun ( too much heat is not good for the Polycarbonate- take note, that I've wrote "warm" ). The same "Warming" treatment goes for the spray can- any aerosol can will typically explode when enduring too much heat- the temp. of water from my water cooler dispenser seemed to suffice.
I still can smack a barrier, whereby initiating a paint chip; the idea i'm trying to convey[ aside from me needin' more run / practice time ] is that my tips aren't fool proof.- Polycarbonate car paint cans [ie. Parma's faskolor , Spaztix] typically fit into a Dunkin'Doughnuts Med. size coffee cup when i'm using my method of warming [my spray cans].-Greg