Wilko Exterior 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 16-24 hours, it's the perfect base for a finishing gloss topcoat. The contents of this can will cover approximately 9 square metres** which after 1 coat, is about the same width as 5 1/2 standard doors. (**Approximate coverage depends on the surface to be painted, see the back of can for more details). *When used as an undercoat to wilko exterior wood & metal gloss on sound, prepared surfaces.