In some cases, the mask material will not adhere properly to the unpolished, porous surface of a brick. We have found great success in applying an extra layer of adhesive to the mask. This will help the mask have a greater bond.
For best results, heat the brick surface with a mini torch or heat gun until it is hot to the touch. The heat will cause the adhesive to become aggressive when applied to the hot surface. Squeegee the mask using pressure and remove clear liner. At this point the mask is secure and can endure sandblasting.
-Liz Haas, Rayzist