It seems that a couple of people are confused with the Seal All process. Its not something you pour into a engine that is already together. This is a sealer thats done with the head already off.Two totally different process'.Most often used to protect proting jobs and so forth, and it DOES work, IF done right.This isnt a can in the radiator fix.

I would tend to agree, if its off already, then weld it.

I answered the question that was asked. I was assuming there may be a reason the OP didnt want to, or possibly couldnt weld it. Dont know for sure.