Cuprinol Anti-Slip Decking Stain 2.5 litre in Urban Slate gives a rich, semi-transparent colour with a hard-wearing, durable finish. It has a unique double action formulation with invisible anti-slip microbeads to make decks safer than untreated wood. The algicide helps protect the film surface from green algae and mould growth too. Warning: Keep out of reach of children. Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. Always read instructions before use.