If you are just trying to cover a small hole, proper surface prep (with etching of the plastic), some JB weld and a piece of black plastic. You will have to tape the piece in place until the JB weld cures. This may get you by for a while, but as the plastic heats and cools, the patch could eventually come loose.
The liner can be purchased for under $35, with some basic tools it can be replaced. Big thing is a good set of jack stands to keep the car up in the air and a variety of screwdrivers to tuck the liner back into the body/cladding. Taking time on this project is important, you have to cut the old liner out and put the new one in without removing the plastic fender trim.
Link to video, see if you have the needed items:
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