I bought my pool last summer & had no problems. It started leaking around one of the windows last week. We used the locktight marine grade sealant inside & outside around the window. There was still a leak & now a couple inch rip in the liner next to the window. Drained below window, used two more tubes of the locktight, let it cure 24 hours, filled pool up again. Got up this morning & it did not hold....water is gushing out again. Has anyone had luck fixing this with something else?