a superior matt emulsion the emulsion to use when you have to cover dark colours . clean brushes in water. recoat 2-4 hours. coverage 8 square mtrs per litre application roller, brush or spray. touch dry 2 hours. johnstone's ultra high opacity matt is a high opacity emulsion designed to cover dark colours.it is water based and easy to use and dries to a tough hard wearing matt finish. high opacity designed to achieve the appearance of a two-coat application in just one coat.