West System G/flex 650 Toughened Epoxy – Strong, Flexible, Waterproof Adhesive

West System G/flex 650 is a toughened, versatile liquid epoxy designed for permanent, waterproof bonding of a wide range of materials, including fibreglass, ceramics, metals, plastics, and damp or difficult-to-bond woods. Offering more flexibility than standard epoxies while remaining much stiffer than traditional adhesive sealants, G/flex 650 absorbs the stresses of expansion, contraction, shock, and vibration, making it ideal for structural and demanding repair projects.

Key Features and Benefits:

• Bonds to plastics, metals, glass, masonry, fibreglass, and other dissimilar materials
• Creates durable, permanent, waterproof bonds for marine, industrial, and home applications
• Flexible yet strong formula absorbs stress from movement, vibration, and impact
• Compatible with WEST SYSTEM fillers and additives for custom applications
• Can be used to wet-out fibreglass tapes and fabrics for laminating projects

Common Applications:

• Aluminium boat repairs
• Polyethylene and ABS canoe or kayak repairs
• General bonding and assembly of dissimilar materials
• Fibreglass laminating and reinforcement

Product Specifications:

• Mix Ratio: 1:1
• Pot Life (100g at 25°C): 45 minutes
• Working Time (thin film): 75 minutes
• Cure to Solid (thin film): 3–4 hours
• Cure to Working Strength: 5–7 days
• Modulus of Elasticity: 1 GPa
• Colour: Amber
• Consistency: Honey-like

Consumer Package Includes:

• 1x Resin
• 1x Hardener
  (*Industrial sizes C & E sold separately)

Available Sizes:

• 650-8 | 240g | G/flex 650 Epoxy Pack
• 650-32 | 1 ltr | G/flex 650 Epoxy Pack
• 650-2GR | 4 ltr | G/flex 650 Epoxy Resin
• 650-2GH | 4 ltr | G/flex 650 Epoxy Hardener
• 650-CR | 20 ltr | G/flex 650 Epoxy Resin
• 650-CH | 20 ltr | G/flex 650 Epoxy Hardener

Instruction sheet – HERE

West System G/flex 650 provides a reliable, waterproof, and flexible bonding solution for marine, industrial, and DIY projects, delivering long-lasting strength for both routine and challenging repair applications.