Tara, try cleaning the area first, if there's dead algae or other stuff, it will interfere with the glue. You can use a wallpaper seam roller (~1" roller used to seal the seams in wallpaper) to keep pressure on the patch while the glue is setting, just keep rolling back and forth & up and down.
There is another 'do or die' trick, but I hesitate to mention it for fear someone could ignore my warning a nd further harm their liner. I'll post it if you can't get another patch to stay after following the above advice.
Give it another good try and if that doesn't work, I'll give the other way
p.s - the quicker you apply the patch after putting the glue on, the less chance of the curling
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