Welcome to The Forum!

How large are the voids or wrinkles?

Are they uniformly around the pool?

As for a liner sitting outdoors - they won't, per. se. shrink, unless it's ~ freezing and it's usually a good idea to let them sit outside a day or 2 before a spring install (so that it's 'daytime warm')

Any chance of some pics? (They really can be worth 1000 words )