In respect to 2k paint systems you can buy an additive called flex-aid,i'm sure there are others too.To test,spray a couple of coats onto an unprepared plastic surface eg;the back side of a cutting board,icecream container,plastic bottles etc and let it cure properly(1 to 7 days depending on temp)then scrape an edge up and start peeling.Comes off in large sections with little effort.You will be able to tear or cut strips of it easily so save some for a month or two and you will notice a slight hardening tho not significant,it will retain an amazing degree of flexibility,fold some in half flat between your fingers,i don't think you'll be doing that while it's attached to your model..

Next add some flex-aid at the recommended 10% by volume(mixed)and repeat

It will take an amazing amount of carefully applied heat for short periods and will temporarily soften.Be careful with yellows in particular as they tend to go slightly red when heat is applied.Hope this helps