there is a small hole in our liner and outside wall though ive made sure there are no sharp edges on the poolside i cant seem to get a patch to go on properly after applying the glue to the patch and pulling it apart underwater it just doesnt adhere properly ive cleaned up the surrounding area with a abrasive pad and sponge.also now iam starting to see what i believe to be rust from the inside wall making sharp points toward the liner,the pool is only 5 years old,any ideas?? :?