Ok I know this has been covered before, I've got a small crack on a rib( If thats what you call it)that runs the length of the boat on the out side of the hull on the bottom several years ago I jb welded it and it lasted several years but it's leaking again. I was going to grind off the jb weld and want to patch it but not sure how too. The rib is rounded and would need some thing flexible to mold around it i've seen some things about patching with fiber glass. I know the proper thing to do would probably be to pull the floor and foam and weld it but the crack is only about half too 3 quarters of an inch long and hasn't gotten any bigger. The jon boat is 40 years old so I'm not worried about the looks. Any ideas thx.