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

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.