Sikaflex 221 Polyurethane Sealant / Adhesive

Sikaflex 221 Polyurethane Sealant & Adhesive is a one-component, multi-purpose polyurethane sealant and adhesive designed for a wide range of construction, roofing and general bonding applications.

It cures on exposure to atmospheric moisture to form a durable, elastic seal with excellent adhesion to many common substrates, including metals, GRP (fibreglass), timber, plastics and painted surfaces. Its flexibility allows it to absorb movement and vibration, ensuring long-term performance without cracking or failure.

Sikaflex®-221 offers good resistance to weathering and ageing, making it suitable for both internal and external use. Supplied in a convenient 310ml cartridge, it is easy to apply using a standard sealant gun and is trusted by professionals across multiple industries.

Available in White and Black, Sikaflex®-221 is a reliable all-round solution for sealing, bonding and jointing tasks.

KEY PRODUCT FEATURES

• 1-part polyurethane sealant & adhesive
• Cures with atmospheric moisture
• Flexible and elastic once cured
• Good adhesion to many construction materials
• Suitable for internal and external use
• Durable and long-lasting seal
• Easy application – 310ml cartridge
• Available in White or Black

AVAILABLE COLOURS

• White
• Black

Here are 5 more great reasons to buy from us:

Returns are easy, if the items are�unopened and unused�then simply�contact us�for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

In the unlikely event that you find your item cheaper at another online store, just let us know and we'll beat the competitor's pricing hands-down.

We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.

Ordering from APEX Fibreglass Roofing Supplies is 100% safe and secureso you can rest easy. Your personal details are never shared, sold or rented to anyone either.

Here are 5 more great reasons to buy from us:

Returns are easy, if the items are�unopened and unused�then simply�contact us�for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

In the unlikely event that you find your item cheaper at another online store, just let us know and we'll beat the competitor's pricing hands-down.

We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.

Ordering from APEX Fibreglass Roofing Supplies is 100% safe and secureso you can rest easy. Your personal details are never shared, sold or rented to anyone either.