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Bondo won't adhere to plastic. There really isn't a fix for it other than replacing the part. If you are intent on a patch you might get some epoxy for plastic and try gluing it back together. You would need a couple C clamps and perhaps a pipe clamp to align the part and pull it together.
 

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Not long ago I repaired a plastic bumper on one of our cars. I started with plastic welding and it did pretty good but after a while the vibration of the car caused the cracks to re-appear. After welding it several times with no long term satisfaction I finally covered the area with fiberglass cloth using epoxy for plastic as the resin. Then once sanded and shaped bondo then adhered to it and the repair worked. (That is until a girl text messaging ran into the car totaling the bumper.)
 

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This is what was left of the bumper. The part I repaired was the right corner. It was about 20 pieces including a piece of a plastic paint pail I used to replace a missing piece. After the wreck I decided to give up trying to repair it. Way too many pieces.
 

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