MAPESIL AC - Pure, mould-resistant, acetic silicone sealant with BioBlock technology for movements up to 25%. Revamp your home with ease with the MAPEI Mapeisil AC 174 Tornado Silicone Sealant 310ml. Backed by bio-block technology, this silicone sealant handles up to 25% movements while providing excellent mould resistance. It's highly elastic and perfect for sealing, filling gaps, bonding various surfaces together, and more. Weight: 0.6834330122 pounds, Manufacturer: Mapei