Can I apply microcement on gypsum plaster?

Gypsum plaster is suitable only for dry interiors and only if it is stable and thoroughly dry. In wet areas, it is better to opt for a more secure system with waterproofing. It is not just about the type of substrate but mainly its condition. Before application, check the strength, evenness, grease, dust, cracks and any movement. If the surface is risky, it is better to reinforce it or first create a test area. Proper priming is essential.