Mohs Hardness Test Mohs hardness 7-8 (Top layer); after removing the cream layer, the Mohs hardness rises to 8-9. Ashine Extra-Soft Metal Bond to Remove Cream Layer Using 60# Extra-Soft Metal Bond to open the floor, consistent diamond exposure from the metal bond formula's self-sharpening properties ensures a high-efficient cut. Work efficiency: 50 square meters per hour. Resolve the Scratches on the Low Spot Because the floor is uneven, some irregular scratches will occur in low spots during the grinding process