Can I apply microcement on OSB boards?

OSB boards are a more risky substrate because they react to moisture and structural movement. They are only suitable if they are firmly fixed, do not flex, and the joints are properly secured. It is not just about the material of the substrate, but especially its condition. Before application, check for strength, flatness, grease, dust, cracks and any movement. If the surface is risky, it is better to reinforce it or first make a test area. And, most importantly, ensure joints are securely fixed and apply at least two OSB layers crosswise.