I'm with Andy...having just replaced our liner....

During filling I wondered if the corners would EVER fit.... they absolutely did, so never underestimate the power of wate pressure.

Had some anxieties during filling...even halfway up the walls, I had corners hanging out 6"or more, they are now now maybe 1/2" away, AT THE MOST.

Now that it's filled, we couldn't be more pleased with the fit. No wrinkles and the liner stays in the bead throughtout.

Better to have a tight fit when it comes to liners.

Hope this helps, Tony