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 999 Transparent 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. Transform your home with the Mapei Mapeisil AC 999. This 310ml transparent silicone sealant boasts bio-block technology for superior mould resistance and elasticity, accommodating up to 25% movement. Ideal for sealing, filling gaps, and bonding various surfaces, ensuring a robust and lasting finish.