Originally Posted by Model Aero
That motor should be a screamer.
I've found the same thing with paint on foam ARF'S, especially ones molded from EPO. It's by far the best foam, but there are release agents used during the molding process that can inhibit the paint from sticking well. As long as you're careful it's fine. Mine still looks great after many flights.
Most polyolefin do not accept finishes without some kind of pre treatment
to etch the surface. It does not have as much to do with the release used as it does to the material composition itself which has a natural lubricity.
Flame or plasma surface treatment may possibly deform the foam but there are special ink compositions for printing on treated or untreated surfaces of polyolefin plastics.
The manufacturer could possibly find a paint or ink that will adhere better.
In the mean time, I am anxiously awaiting my new kit.