"Training" Fiberglass

I'm trying to get myself to start doing the bodywork on my Duster. It's my least favorite part of the hobby. Mostly because I hate messes; and it makes a mess of my garage! It's one of those things that once I get started, it's okay. But anyway...

One problem is the fiberglass fender has a bulge in it, which lowers the top of it. If I push in on the bulge, I can get the alignment close enough that I could work with it. But it won't stay where I move it. The 2 pictures should show what I mean.
I tried pushing it with a 2 x 4 that was wedged between the fender and the garage wall. It was pushed farther than needed. I left it there for a month or two, but it didn't budge.

Is there a way to retrain the shape?

I'm not a body man by trade, but I've done some in the past. My goal is to do enough to get it close, and let the (unknown, at this time) shop that paints it finish it.


KI8hlc.&owa=outlook.live.com&scriptVer=20230526012.jpg

mHMxUc.&owa=outlook.live.com&scriptVer=20230526012.jpg