I have seamed two different liners together that's what I have now it was only my foolish mistake that I cut near the waterfall before I had it all figured out and when I went to place the liner back down I had cut it to short, it was crooked and somehow I had bunched it up, so I ended up with a large odd shaped whole and instead of patching over it I somehow patched under lol, I think I was frustrated and feeling foolish because something told me not to cut it, I never cut my liner, I normally will figure out a way to hide it even if its a lot left over, but something had me aggravated that day and I went against myself and here I am three seasons later fighting with the same issue. Luckily I have learned alot from my mistake. My husband comes home everyday expecting everything to be put back together and I keep telling him, " I'm not repeating what I have the past couple years that regardless of how it ends up that it gets done right, I'm not doing anything else til I figure out how to fix it for good" with that said I am def taking the main pond apart and putting a new liner, I know their is no fixing what I have and I'm wasting alot of time, energy and money trying to beat something that isn't worth the hassle!