I've had good luck with Duramix 4040 on the skidoo hoods. It is an epoxy type product available from auto supply stores.It requires a special applicator similar to a caulk gun to apply.
You could get it plastic welded.There are many companies that specialize in this and it is relatively cheap,and after it is done and painted it's hard to tell it was ever done from the outside.Just a thought.
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