Johnstone's Trade Flexible Primer Undercoat Paint is an easy and quick product to use with it being both a primer and undercoat in one. As part of the Stormshield range the Flexible Primer Undercoat is a premium range exterior primer which has up to an 8 year life expectancy - depending on conditions. Perfect for use with other Johnstone's Stormshield products such as the Flexible Gloss and Flexible Satin topcoats, this Johnstone's Flexible Undercoat has a quick-drying time and gives a smooth finish every time. It retains flexibility longer than traditional undercoats and is microporous & crack resisting. Can be used on softwood, hardwood and plywood panels, also can be used on suitably primed metal surfaces. Available in White & Grey. For more options, shop our full paint for metal collection.