Belzona is the best!
I work on ships where cracked blocks, boiler holes, you name it have to be repaired at sea. The Devcon line of products are good. We use them in low stress areas as Devcon is cheap. For "We at Sea", Belzona is ABS and DETNORSKE approved for such repairs (the alternative is replacing the parts). In many cases, it sets harder than the metal you are repairing. It can be filed, ground, and polished and is essentially liquid metal. I don't know where you can purchase it outside the maritime industry. I had to check the spelling (thought it was called Balzona) and they do have a website. It comes in a small pearshaped container and is sold by weight. It's not cheap stuff. If you have a job (like plugging a hole in a crankcase) and don't mind the expense, It's a permanent fix. Good luck Smitty
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