I'm looking to smooth out the front fenders of my 57 pontiac chieftan. The headlight bezel screws into the fender, i want to weld in the gap. Problem, the headlight bezel is a cast white metal(?) don't really know how else to describe it. Can't mig it to the fender, tried brazing, but the cast melts before the rod and the bronze won't stick. Used flux coated bronze braze rods, both 1/8 and 3/32. welding shop recommended Zinal rod, never heard of it and it cost $100 for a pack, anyone use this stuff and do you think it will work? Or anyone have any other ideas? I also tried the eastwood leadless body solder and that didnt stick ot the cast, stuck to the steel good but not the cast. anyone got any other ideas?