Does anyone know this is possible?...I have a spoiler that has a pretty good fit..but except the end..

 

Fiberglass doesn't really want to bend... ...hence the chips in my front bumper. But you might be able to shave and reshape it, if it's not too extreme.

 

depends on the shape where you want to bend it, if its relatively flat, then it should have some bendability to it, however it is curved, it may not. Fiberglass is very stiff at angles, but relatively flexable in a flat direction

 

Fiberglass cloth is very flexible until you apply the resin, then it's a bit stiff.