Tala wax discs for making homemade preserves. Pack of 200. For making homemade preserves. Pot the jam / preserve and cover with a wax disc. Do this whilst the preserve is piping hot or completely cold, to help exclude air and prevent deterioration. When the jam is fairly cold the jar should be topped with a damped cellophane disc and secured with an elastic band. The cellophane will shrink when it dries to create a tight seal over the jar.