Cord
Veteran Member
Have a piece of cast iron that was previously welded and the weld didn't hold. I'll be grinding it out and replacing the welds. I can see several cracks which are parallel to the original weld that will now need to be repaired as well. Once I start grinding out the welds I'll probably loose sight of these secondary cracks. I've heard of people mixing chalk with acetone, but I don't want to risk contaminating the weld. Is there something else that can be used in the home shop? Please don't say manga flux because that's prograde stuff that requires special equipment.