West System G/flex epoxy kit with resin and hardener West System G/flex epoxy kit with resin and hardener
West System G/flex epoxy kit with resin and hardener

West

WEST SYSTEM G/flex 650 Epoxy – Toughened Waterproof Marine Adhesive

$99.90
Tax included.

Repair, bond, and reinforce with confidence using WEST SYSTEM G/flex Epoxy—a toughened, high-performance marine adhesive designed for demanding applications where strength, flexibility, and durability are essential.

Unlike standard epoxies, G/flex is engineered to be slightly flexible while maintaining structural strength, allowing it to absorb shock, vibration, expansion, and contraction without cracking or failing . This makes it ideal for marine environments and difficult bonding situations.

This two-part epoxy system (1:1 mix ratio) is easy to use and delivers a permanent waterproof bond across a wide range of materials including fibreglass, metals, plastics, glass, masonry, and damp or oily woods . It’s especially effective for bonding dissimilar materials, a common challenge in boat repairs.

With a long working time (~75 minutes) and strong adhesion properties, G/flex is widely trusted for both structural repairs and general bonding tasks, from fixing cracks and leaks to reinforcing joints and laminating fibreglass.

Available in both liquid (650) and pre-thickened (655) formulations, G/flex provides flexibility for different repair and construction needs.

Key Features

  • Toughened epoxy formula – absorbs shock, vibration, and movement
  • Waterproof bond – ideal for marine and wet environments
  • 1:1 mix ratio – simple and user-friendly application
  • Bonds dissimilar materials – plastics, metals, wood, fibreglass & more
  • Long working time (~75 mins) – allows precise application
  • Flexible yet structural strength – stronger than sealants, more forgiving than rigid epoxies
  • Compatible with fillers & fibreglass cloth – versatile for repairs

Specifications

  • Brand: WEST SYSTEM
  • Product Type: Two-part toughened epoxy adhesive
  • Mix Ratio: 1:1 (resin : hardener)
  • Pot Life: ~45–46 minutes
  • Working Time: ~75 minutes
  • Initial Cure: 3–4 hours
  • Full Cure: ~24 hours (load after full cure)
  • Colour: Amber
  • Waterproof: Yes

Ideal Applications

  • Aluminium boat repairs and leak sealing
  • Polyethylene kayak and plastic repairs
  • Fibreglass bonding and reinforcement
  • Wood bonding (including damp timber)
  • General marine, automotive, and household repairs

G/flex is widely regarded as a go-to epoxy for difficult bonding situations, especially where standard brittle epoxies would fail due to movement or stress.