When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The proper way to repair a crack in metal, is to drill a "stop" hole at the end of the crack, so it has no where to grow from. Then use standard welding & resurfacing techniques to finish the repair. If this aviation level of repair is too extreem, & depending on where the crack is; You may just want to put a fiberglass supporting patch on the back, & use bondo to resurface it. Kinda a ghetto repair.
The stop drill & weld, method is the best way.
Yeah, on re-reading your prolly right. So...
I dont know where to get the TV advertised plastic repair stuff,....Possibly using a dash mat to cover the cracked area, will work for you. However when the dash pad cracks are too bad, a compleat skin can be purchased to recover the dash pad with. I'd just get a new dash pad, and be done with it. Once a pad gets so brittle it starts cracking, its just gonna crack more.
I have thesame problem and i will try with poliurethane foam and then i will try to upholster the pad with some plastic leather. Maybe i will need a new one, I don't know if it worst the time or the money.