My 7 yr old 20x48 UF liner is finally dead. Thinking of doing HBah923's overlap liner replacement. Looks good to me.
http://www.troublefreepool.com/threads/40579-Installing-replacement-liner-inside-of-Intex-18-metal-frame
http://www.troublefreepool.com/threads/40579-Installing-replacement-liner-inside-of-Intex-18-metal-frame