Speak to someone who is actually a painter, preferably someone who works for someone like Renault or Smart.
I say this for a reason, the front wings on some renaults are actually plastic, as are most body panels on a smart car, and they are designed, with paint to flex without cracking, so if you could come across the paint you use for those cars, you may have some luck, i have seen smart panels bend a considerable way about 45% without any marking to the paint at all, so this may be a suitable solution...
As i'm not a painter i know nothing about how it works, but i have been told it is not the same paint you use on cars normally...
Height 5"11, Weight 200-210lbs, Born 1969
Regular Stance, Ability NOT GOOD
2012/13 114 days
2013/14 102 days
2014/15 107 days
K2 Fastplant 154, Ride DH2 158, Endeavour Vice 155, Signal OG 155, NS Evo 157 (Stolen), Flow Quantum 155