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No problem welding pin holes in a hull. Clean the corrosion by using the tip of a drill, about 3 times the size of the hole. Don't drill right through, just make the surface shiny.
Its surprising...

Scouser, I have a double barrel muzzel loader, and I use 70 grains of 2F powder, and use the same measure for the shot. I use 1/4 of a paper towel as a wad on the powder, and 1/2 a paper towel
on...