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  3. Surface preparation for Terrastone

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.