Sikaflex 291i 70ml – Marine Adhesive & Sealant (Polyurethane)

Get reliable, professional-grade sealing in a convenient size with Sikaflex 291i 70ml—a versatile marine adhesive and sealant trusted by boat builders and DIY users across New Zealand.

This one-component polyurethane sealant cures with atmospheric moisture to form a durable, flexible, and waterproof seal, making it ideal for a wide range of marine applications.

Designed specifically for the marine environment, Sikaflex 291i delivers excellent adhesion to common boatbuilding materials including fibreglass (GRP), wood, metals, and painted surfaces.

Its permanently elastic properties allow it to absorb vibration and movement, ensuring long-lasting performance without cracking or failing—perfect for dynamic marine conditions.

The 70ml tube format is ideal for small jobs, repairs, and maintenance tasks where a full cartridge isn’t required—saving waste while still delivering professional results.

Key Features

• Marine-grade polyurethane sealant – designed for boating applications
• Flexible & vibration-resistant – won’t crack under movement
• Excellent adhesion – bonds to GRP, wood, metal & plastics
• Waterproof & weather-resistant – ideal for harsh marine conditions
• Can be sanded & painted – clean professional finish
• Non-corrosive & low odour – safe for marine materials
• Compact 70ml tube – perfect for small repairs and touch-ups

Specifications

• Brand: Sika
• Product Type: Marine adhesive & sealant
• Base: Polyurethane (1-component)
• Cure Type: Moisture curing
• Size: 70ml tube
• Colours Available: Black, White
• Application: Sealing, bedding, light bonding
• Use: Interior & exterior marine applications

Ideal Applications

• Sealing deck fittings and hardware
• Bedding hatches, windows, and ports
• General marine repairs and maintenance
• Sealing joints and gaps in hull or topsides

This is one of the most widely used sealants for general-purpose marine sealing, especially where flexibility and ease of use are key.

Why Buy from Barton Marine NZ?

• Trusted NZ marine supplier
• Fast nationwide delivery
• Genuine Sika marine-grade products
• Ideal for DIY and professional use

Pro Tip 

For best results:

• Ensure surfaces are clean, dry, and grease-free before application
• Use masking tape for clean edges
• Allow proper curing time—slower in colder conditions