The ronseal ultra tough clear varnish range is an ultra tough polyurethane varnish which provides a rich clear mellow finish to interior wood that is ideal for use over wood dyes the varnish is heat water and scratch resistant with long lasting protection against knocks and most household chemicals in the home this product provides long hard wearing protection on wood and is suitable for any bare or previously treated wood application brush drying time 2 4 hours coverage 24 square metres covered