Welcome to the forum!

Janet gave a GREAT response!! (she covered everything I'd have said)

A day or 2 of direct sun isn't going to harm the liner, but it really doesn't matter - because you're not going to be using an improperly cut liner. As long as you provided them the correct pool measurements, it's their responsibility to cut the liner correctly for your pool (NO ifs ands or buts!)

I don't blame you for wanting to save a few $K - there are some tips on liners here if you use the 'search' function. If nothing in the old posts helps, I'll tell you a couple things about properly dropping a liner


Good luck with resolving this - we'll be here to help and please let us know how you make out with it!