What should the surface be like for Terrastone?

The surface must be clean, stable, dry and evenly absorbent, free of dust and surface laitance and must be free of non-adhering old coatings.

The surface quality of plaster and gypsum board should be at least between Q2 and Q3.

In addition, the surface must be primed with a quartz-containing plaster primer before applying Terrastone.