Laguna has recently changed their wax formula. It is now called Laguna Premium wax. It is no longer the same formula as Mobil-Cer-A.
Wax Resist is a wax emulsion that repels underglazes and glazes that are applied over it. The wax will burn off during the firing process, revealing designs or base colors underneath. To use, apply to greenware, bisque, underglaze or glaze, and allow to dry for several hours before firing. This product is similar performance to heated paraffin wax, but with less mess. Wax Resist will be damaged if frozen or kept in cold temperatures, even cold air during the winter.