i have used it on several things . used it in my pontoon . i had a crack i had it welded it still leaked . i used jb weld still leaks . to much flex . think i will have to have a patch welded over it . may just use screws to hold the patch with a epoxey under it . not sure if it is thick enough to hold a screw . it doesen`t leek much after 3 dayes it will have a galon or so of water . as long as i don`t have to leave it for a long time it will be ok for now .