Thompsons Patio & Block Paving Seal Natural finish protects and seals patios from the weather in just one hour. The powerful formula will resist algae growth and protect against oil and fuel stains. The Natural finish leaves a barely there finish, so your patio is protected without leaving a sheen. What are the features of Thompsons Patio & Block Paving Seal? Resists oil and fuel stains Resists algae growth For use on all block paving and flag stones Technical Coverage: Approx. 7.5m2 per litreColour: NaturalDry time: 1 hourTin size: 5L