Lowered Depths
+1y
I'd go buy a door skin, some drywall tape (the tape that you mud over), go to the parts store get some 3M 8115 two part, and some bondo or glaze, and go to town. Cut out a filler piece like you would for steel doors and put some tape on one side, lay down the drywall tape on the opposite and use a putty spreader to spread the 8115 over the tape. Let it cure overnight and do the same to the other side, let it sit overnight as well. The next day, take a DA and some 40 grit to sand it smooth, then run some glaze and finess it to be ready for primer. Before primer make sure you use adhesive promoter and then spray. That is the best and strongest way to save plastic handles. Fiberglass won't stick as well as people would think.