Finally, the cast iron surface is ready to be patched and healed. Use a putty knife to fill the hole or crack with the compound. A few best epoxy forcast iron pipe repairsis JB Weld Twin Tube and EP-200 plumbing epoxy putty. Once you apply the compound, let it set. Step 4. Use a...
Does JB Weld work on cast iron? Purchase a tube of epoxy putty such as JB Weld or Quick Steel at your local hardware store. These types ofepoxies act as glue that will adhere to cast iron, filling the crack with a safe seal.