I can see how that could happen! My Dad used to Weld up and Repair Transport Truck Frames! They'd Sandblast then Dip the Frames in these Huge Vats of Acid to Expose Micro Cracks and Fissures in the Frames,Then Weld-em Up! It used to Creep Me the Fuck Out; B'cuz that was exactly what I used to think could happen! And "lo and behold" Dufus makes the splash in the Acid Tank! Poor Bastard!...SP