What type of material is it made from? Polyurethane? Fiberglass? (Doubt Carbon Fiber would warp) Have you tried a heat gun to the plastic? Most merchants say that using a heat gun will help massage it back to it's original shape.
Do you know the proper steps to painting it?
1) Clean with degreaser (Simple Green is always great.)
2) Scrub with Scotch pad (Get autobody grade)
3) Wipe away the Scotch pad fibers with rubbing alcohol and a rag
4) Spray Adhesion Promoter (Do not skip on these steps unless you want to redo the paint after it starts to peal away.)
***At this stage you will find that the plastic starts to firm up! Even after the adhesion promoter is applied.***
6) Base coat
7) Clear coat
Follow these steps and it will look like a pro did it. Worked for me.