Apply this primer & undercoat from Dulux Trade to interior & exterior, using a brush, to prepare the surface for painting. It takes 2-4 hours to dry and will cover 13 m² per litre on average. This water-based, high opacity, dual purpose primer undercoat is ideal for use as a primer for softwoods, hardwoods, chipboard and fibre board (except fire retardant-treated types). It can also be used as an undercoat for woodwork that has been previously primed or painted with either solvent- or water-based paint. It offers excellent adhesion and opacity.