I'm working on bodywork on my car and the front bumper has the typical sags in the top front flat parts. I have ideas how I'm going about straightening it, but are there any tried and true methods? My guess is heat and flattening plates clamped in place. I am shooting for better than average fatness. This was an Arizona car so the sun wasn't friendly on the plastics..

 

69-r just did this in his 83 h.o. restoration thread.

 

Yup that's the first thing that came to mind! And a plate is exactly how he did it

https://www.thirdgen.org/forums/hist...st#post6581903