Two-component, NMP-free, water-based undercoat with very low emission of volatile organic compounds (VOC) and high insulating capacity, for preparing solid and pre-sanded wooden floors and wooden floors under repair for water-based finishing cycles. TECHNICAL DATA: comp. A comp. B Consistency: liquid liquid. Colour: milky white transparent. Density (kg/m³): 1.030 1.075. Storage: 12 months 12 months. EMICODE: EC1 R - very low emission level. Duration of mix: 2 hours. Mixing ratio: comp. A: comp. B = 5 : 1 (in volume). Maximum permitted dilution ratio (Dir. 2004/42/EEC): 10% with clean water or with ULTRACOAT EL. Sanding: after 12 hours. Varnishing (without sanding): after 2 hours, within 5 hours. Consumption: 80-100 g/m² per coat. Packaging: 6 litre kits (A+B), 2x6 l boxes.