Over the years, I tried several times to 'uncover the secrets' of liner life expectancy, since it varies so much.

Short version? Durability is largely determined by the PVC + additive mixture used in making the raw, un-patterned sheet . . . and that mixture is determined by sheeting manufacturer, who is NOT the "liner manufacturer. Liner manufacturers BUY sheeting, print it with patterns, and the piece it together, but don't make the plastic. I learned that much, with two 'off-the-record' conversations with a product engineer at one of the major N. American makers.

Bottom line? There is not any way i have discovered to determine liner life in advance! "Better liners" (ie, more expensive) tend to last longer but that is by no means assured.

Sorry!