There's a very good product available in NZ called Belzona (spelling??) E-Metal.
It's a 2 part mix. It was used to do a repair in situ on a gear box that had a chunk break out of it at the last comapny I worked for.
GB eventually replaced but the E-Metal held.
https://www.belzona.com/en/products/1000/1211.aspx
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