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Seals and Roof Treatment | Aggregates & Chemicals | Screwfix.comWe have a strong selection or roof seals and treatments from brands such as Evo-Stik, Thompsons and Cementone to ensure a long lasting and waterproof finish to your roof. | 1000's of products available in-store and online at low trade prices | FREE next day delivery available | FREE collection in 5 minutes | FREE Returns