Plastic Grill Housing Repair

I have fixed many 69 cuda grills. First I’d remove the the plastic grill from the chrome trim and enlarge the holes that the pins set in. The plastic grill shrinks but the chrome trim piece doesn’t which is what leads to the cracking. I then repair the crack and or replace missing sections with a product call Plast-Aid. No reinforcement is needed other than a little overlapping of the material on the backside. The repair is stronger than the original material. One note is that the Plastic-Aid cures very hard and I’ve had to use a Dremel to rough it to shape.