The front air dam of my car is plastic, as has some pretty hefty cracks in it.
I repaired it once before with Bondo… and it looked pretty good. For about 3 days. (it was meant to be a temporary fix just to close the gap in the cracks… but not that temporary!)
The problem was, the air dam moves the slightest bit. It shakes when the doors are slammed and when I hit big bumps. Not to mention when I scraped it on the ground trying to exit my buddies driveway which is a very steep incline.
What is out there that its a filler-type product, but is flexible? Even just slightly flexible? Some sort of plastic filler? The regular mud worked great until it cracked again.
I have some time to figure it out, but I don’t want to have to redo the damn thing every year. I might just fiberglass it anyway, so the whole thing is less flimsy and more rigid. (Then there is more of a chance of it cracking/breaking than just flexing when it makes contact with somthing.)
The piece in question: (most closeup shot I have. This is from when I first bought the car, I hadn’t painted or repaired the damage yet.)