I work at a waste water treatment plant and one of our pumps devoloped a pin hole in the cast housing and is leaking. I tried a cast rod but its paper thin and just opened up on contact and is now the size of a dime. Im thinking tomorrow to grab the mig gun with stainless wire and try to put a band-aid on it until we can rebuild it. any ideas or comments would be much appreciated. its up underneath and is dirty and i can even fit a grinder where it is..

Thanks in advance
Bill