I have 10 year old liner that's on the verge of needing to be replaced. Had several corner leaks in the past that let out significant water until patched.. ok I get it.

But now I have 2 sizable floor tears in the center of the shallow end of the pool and am not any leaking any appreciable water. Why?

Also, as an aside, is there any meaningful difference in the vinyl adhesive that comes in patch kits and pvc cement I use on my sprinkler system?

thx, SR