Sagging liner

[cantileveredge]

Liner in my pool has a few spots that come loose every year. I've always put it back by hand except for one year in the spring when it was cool. Used a hair dryer with a GFI cord plugged into a GFI outlet. Worked with my hands in the heat... if my hands got too warm then the liner was probably getting too warm. Would also like some feedback on liner lock from others. I've used pieces in the past to address trouble spots but the pieces pop out. Liner continues to pop out all year also in new spots. I have an old (20 yr+-) Buster Crabbe IG with polymer walls and they just dont hold the bead. This year I'm getting a whole roll and locking the whole perimeter. If that doesn't work I may have to install new aftermarket coping and reset the liner.

[matt4x4]

If too much of it pulls out or it sinks too deep to get back up manually or the heat/stretch method is no longer going to work because of all of the above, you do what's called "floating the liner" - essentially you start pumping your water behind the liner, this will make it float up some, this will allow for it to lift up with ease, then you can reseat it in the bead - preferrably using some liner lock to help keep it there longer, once you have almost all of it reseated, you stick your garden hose/pump behind the liner to pump the water you had put there back into the pool and once that's done you finish with the last little piece of liner that still needs to go back on.