I have been fighting a crack for a couple years. It is thin (1/8 -3/16) cheap stainless, I had a welder try to weld it and it burned thru, and when we turned it down it tore. It’s not like a typical crack I have seen. After trying to weld it a few times I filled it with high temp JB weld, that held water for about a month. When it started leaking bad again I cleaned it out real well and filled it with regular JB weld, and drilled a hole to a piece that did not pass thru the water jacket. I made a plate of 1/8 cold rolled steel and covered it with red permatex gasket material and screwed it tight. It held for almost a year. This season I have redone it twice and now I even covered the plate with a 1” insulating material to try to keep it cooler. It’s leaking bad again. I would like to try to make it thru the rest of this season without shutting it down again. When I do it next time a welder friend told me to try braising the crack. I’m good with that but I would like to hold off till it warms up. I’m going thru 6 gallons of water a day. I thought it was horrible but then I think about the old steam locomotives and I know those things leaked into the firebox. Is that much water going to hurt anything I haven’t thought of?