I's probably ABS. If you wipe a little acetone on the back of the panel and you get plastic on the rag that will confirm if it's a butyl type of plastic. If it is you can use regular ABS cement or even acetone and a reinforcing strip of ABS plastic on the back side.

Last edited by steve70; 07/09/21 03:24 PM.
1970 Challenger T/A 4 speed