Blackfriars exterior varnish enhances and protects all wood and external joinery blackfriar exterior varnish provides protection to all types of wood by resisting uv light to give wood superior durability when applied over blackfriar uv wood primer avaliable in satin or gloss application method brush or roller coverage 12 14mlcoat touch dry 4 6 hours hard dry 3 days recoatable 16 hours