Two‑Component Polyurethane Waterproof Coating Construction Technology 1. Construction Preparation Material preparation: Verify model of component A & B, confirm mixing ratio. Prepare stirrer, trowel, brush and measuring tools. Substrate condition: Solid, flat and dry substrate; free of dust, oil and loose particles. Repair cracks and holes with repair mortar. Interface treatment for damp substrate. Standing water on surface is forbidden. Ambient condition: Construction