I have repaired several pieces with a plastic welder the best luck I have had for filler material is to find a broken panel made of the same material and cut pieces from it. None of the filler rods that came with the welder seem to do a very good job. After welding I also use the flexable putty to finish it off.
If you are careful you can use a soldering gun to melt the pieces together from the rear.
Then use fiberglass over the area on the back for strength.
I don't have a plastic welder, and this works pretty good for me.
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