Rustins Exterior Varnish Clear Gloss. Size: 1 Litre. A quick-drying, durable, clear coating which gives a long lasting protection to all external wood and is touch dry in 30 minutes, re-coatable in 4 hours. Clean brushes in water. Available in Gloss and Satin in 250ml, 500ml, 1 litre and 2.5 litres. Also available in Matt finish 250ml, 500ml and 1 litre. Coverage: approximately 12-15 square meters per litre (for 1 coat). Rustins Exterior Varnish is a quick drying, durable, clear coating available in gloss and satin. It gives long-lasting protection to all external wood, is Eco Friendly and has UV inhibitors. It is touch dry in 30 mins, re-coatable in 4 hours. Clean brushes in water. Available in sizes 250ml, 500ml, 1 litre and 2.5 litres.