Flexible Rigid Composite Js Waterproof CoatingSubstrate PreparationThe substrate shall be sound, flat and clean. Remove laitance, dust, oil stains and loose layers. Repair holes and cracks in advance. Fully wet the substrate before construction, keep it damp without standing water. Clean and polish vulnerable details such as corners, pipe penetrations and construction joints.Two‑component MixingFollow the mixing ratio strictly. Add liquid component first, then powder