Oem Odm Js Polymer Cement Waterproof Paint Oem Odm Js Polymer‑Cement Waterproof Coating (JS Coating) Construction Method for Bathroom Waterproofing 1. Base Surface Treatment The bathroom base surface shall be firm and solid. Remove dust, oil stains, release agent and loose sanding parts. Repair holes, cracks and grooved areas with polymer cement mortar for compaction and leveling. Chisel and clean the surroundings of pipe roots and floor drains, then repair compactly. Form