Well since I redid my seats I noticed my door panels looks a little shabby around the edges, the driver side front corner was pulling and very wavy, So I read online of people who say they had good results wetting the cardboard backing and putting weigh on the panels for a few days, I guess the theory is the water will soften them and the weight will re-warp them straight..
I put the panels under a sheet of plywood and and front facing the floor with a plastic tarp on wither side of the sandwich
I think I will wait 4 days and see how they look...maybe the process will require some tweaking if im still not happy.
Al