One-component, NMP-free, water-based rapid undercoat with very low emission of volatile organic compounds, for wooden floors. TECHNICAL DATA: Consistency: liquid. Colour: transparent. Storage: 12 months. Maximum permitted dilution ratio (Dir. 2004/42/EEC): 10% with clean water or ULTRACOAT EL. Sanding: after 2 hours. Varnishing (without sanding) (for three-coat cycles): after 2 hours, within 5 hours. Consumption: 80-100 g/m² per coat. Packaging: 5 litre units.