BITUMEN 25L WATERPROOFER FOR ROOFS. ?

Bitumen 25 litre waterproofer for roofs. A bitumen coating ideal for renovating and maintaining roofs and It penetrates and waterproofs surfaces asphalt, concrete, asbestos, cement sheets, slates, corrugated iron, zinc or lead sheeting. Originally bought from Wickes and is still available at 47. Unopened never used. 20. Thanks.