Sandblasting has been used over and over again to remove paint from brick masonry. The abrasion of the sand striking the surface removes the paint. It also often erodes the surface of the brick and mortar-and adjacent materials that weren't supposed to be sandblasted. Sandblasting requires great care and skill: Air pressure must be constantly adjusted to provide for varying softness of old brick and mortar. Pressure also is affected by height of the nozzle above the air compressor, hose length, size of nozzle, and the size of sand particles used. Sandblasting greatly increases the number and size of cracks between brick and mortar, which can permit wind-driven rain to enter. Excessive sandblasting also can cause aesthetic damage. Sandblasting is dangerous to workers, to brick masonry, and to adjacent surfaces not meant to be sandblasted. The best thing to do is : Don't sandblast.