Hi, I would not use wax paper as it can leave a residue that will be very difficult to remove.
Yikes, thanks for correct that, gofar99.
Sorry for recommending wax paper, Madison, I'm thankful you didn't use it! I'm glad the pizza stone experiment seems to be working out. You can find some professional vinyl record flatteners out there, but they tend to be pricey. Probably wouldn't be worth buying unless you were trying to save a prized collection.