Wilko Exterior Quick Dry Primer Undercoat Paint 750ml provides 10 years* all weather protection to exterior wood and metal. It's more durable than conventional undercoat, making it less prone to cracking and blistering. Dry in 2 hours, it's the perfect base for a finishing satin topcoat. The contents of this can will cover approximately 10 square metres** which after 1 coat, is about the same width as 6 standard doors. (**Approximate coverage depends on the surface to be painted, see the back of can for more details). *When used as an undercoat with wilko exterior wood and metal satin on sound, prepared surfaces.