The Bostik Pro S21 Multi-Purpose Acetoxy Silicone Sealant is a professional-grade, one-component acetoxy curing silicone designed to provide a permanently flexible, waterproof seal for a wide range of glazing, sealing and general building applications. Supplied in a 310ml cartridge, it delivers excellent adhesion to most non-porous surfaces including glass, glazed ceramics and aluminium.

Ideal for glazing, kitchens, bathrooms, sanitary areas and general construction work, S21 provides long-lasting flexibility together with excellent resistance to UV exposure, weathering and moisture. Once cured, it forms a durable elastic seal suitable for both interior and exterior applications.

Suitable for professional tradespeople and DIY users, Bostik S21 offers dependable sealing performance for everyday building and maintenance projects.

Key Features

• Professional acetoxy silicone sealant
• Multi-purpose formulation
• Clear finish
• 310ml cartridge
• Permanently flexible
• Waterproof seal
• Excellent adhesion
• UV and weather resistant
• Interior and exterior use
• Professional trade quality

Specifications

• Brand: Bostik
• Product Range: Pro Sealants
• Model: S21
• Product Type: Multi-Purpose Acetoxy Silicone Sealant
• Colour: Clear
• Capacity: 310ml
• Formulation: Acetoxy Silicone
• Packaging: Cartridge

All dimensions are approximate.

Brand Information

Bostik is a leading global manufacturer of professional adhesives, sealants and construction chemicals. Their products are trusted by professional tradespeople for reliable performance, durability and consistent quality across a wide range of building applications.

Why Buy From Us

• Trusted UK Supplier
• Fast dispatch from UK stock
• Competitive pricing
• Friendly customer support

Delivery

We aim to dispatch all orders placed by 1pm the same day.

We offer 2 delivery services:

Standard 3-5 working day - £5.95

Next Working Day - £7.99

Please note that some items on our site do come direct from the supplier and may not be available on Next Day Delivery.

Collection

We offer a click and click service from our Dundee Depot.

We aim to have orders ready to collect within 24 hours. Please note that this may not be possible if the item is not held in stock and needs to come on from the supplier.