I will ask for some quote to have it reweld. I think they can add filler to reweld, without having to cut the whole thing again.
I wait before I apply any kind of putty because it can be painful to remove.
the other product called host gun gum flexwrap only exists in GB.
I try to find a similar product in the US but have not found it yet.

Will keep you posted. If anyone has suggestions please let me know!