69 Barracuda Dash Bezel

Sand a valley between sides on the crack, Dremel tool works great, then use an epoxy designed for plastic to weld/form them together. licking/wetting your fingers, helps you to mold the glue into shape as it sets up. You can also build a dam with cardboard and masking tape. Just be sure to keep all other areas bagged while you work on the bad part. Sand smooth using progressive grit sand papers till you get to 600. Prime, knock off the dust then start painting your first layer. Tape off and repeat. If you don't want to do the big dollar resto, I can recall an article in a Mopar or Hot Rod magazine, where they did a low buck resto using rattle cans and paint brushes. Little searching may dig it up.