Armstead Trade Quick Dry Wood Primer Undercoat is a professional quality, fast drying, water-based wood primer with good opacity and excellent adhesion that does the work of both a primer and an undercoat. Suitable for both interior and exterior use. Coverage, up to 12m² per litre on smooth surfaces of average porosity, re-coatable in 4 hours dependent upon temperature and humidity. Cleaning up after use, remove as much paint as possible from brushes or rollers before cleaning with clean water. Do not use or store in extremes of temperature and protect from frost.