Thanks Pat and Don. We used to use 5200 on our boats in the Keys...good stuff. Pat I just need something to hold it up flush against the bottom of the metal channel so I can mig weld the patch from the top and on the side edges underneith. I think it will work long enough to spot weld the patch, after that I'll weld the whole area. It's just one of those tight impossible to get to spots for any magnets to hold it in there. Thanks both of you guys!