Memorial stones are generally created on granite. More monument businesses are moving from a vinyl- to a monument-grade photoresist film. Today, photoresist film is tough and durable enough to endure the aggressive sandcarving of a coarse abrasive and obtain fine detail. The detail in a monument photoresist film is separating monument business from those that use traditional vinyl. A 9-mil or thicker can be used as a monument film, and usually additional adhesive must be applied to the photomask.
—Liz Haas, Rayzist