Has anyone tried Loctite 95724 2000 deg epoxy for header repair. or this: http://www.grainger.com/Grainger/BLUE-MAGIC-Metal-Repair-1MPX3?cm_sp=IO-_-IDP-_-RR_VTV70300505&cm_vc=IDPRRZ1 I had to modify some headers I bought and they're leaking a little bit. They're leaking on the inside of collector where the little plus piece of metal is and I can't get anything in there to weld it. I thought I got it all by melting rods in there and pushing the puddle with the torch. Now they're coated and leaking, so I would rather try this if it works for pin holes and not have to burn off the coating and try to re weld.