West System 105 B-Pack Epoxy Resin, 5Kg

The WEST SYSTEM® 105 Epoxy Resin is the foundation of the world-renowned WEST SYSTEM epoxy range and has become the trusted choice for marine professionals, yacht builders and composite manufacturers worldwide. The 5kg B-Pack provides an economical solution for medium to large repair and construction projects where maximum strength, reliability and moisture protection are essential.

This product contains only the 105 Resin and does not include a hardener, giving you the flexibility to pair it with the most suitable WEST SYSTEM hardener for your application:

• 205 Fast Hardener – rapid curing for cooler temperatures and quick repairs
• 206 Slow Hardener – extended working time for larger laminating jobs
• 207 Special Clear Hardener – ideal for clear finishes and bright wood applications
• 209 Extra Slow Hardener – designed for hot climates and very large laminating projects

When mixed with the appropriate WEST SYSTEM hardener, the resin forms a high-strength, waterproof epoxy with outstanding adhesion and excellent resistance to moisture. Its low viscosity allows it to penetrate porous materials effectively, making it ideal for sealing wood, wetting out fiberglass fabrics and creating durable composite laminates.

The cured epoxy bonds exceptionally well to:

• Wood
• Fiberglass
• Carbon fiber
• Kevlar® and reinforcing fabrics
• Composite materials
• Marine plywood
• Foam cores
• Steel
• Aluminium
• Many other prepared metals

Unlike many conventional resins, WEST SYSTEM 105 contains very low VOCs and has little to no solvent smell. produces minimal shrinkage during curing, and creates an excellent moisture barrier that protects structures from water penetration and long-term degradation.

Whether you are repairing a GRP hull, laminating composite panels, bonding timber structures, encapsulating wood, or manufacturing custom marine components, WEST SYSTEM 105 delivers professional-quality results with proven long-term durability.

Key Features

• Premium marine-grade epoxy resin
• 5kg B-Pack resin only (hardener not included)
• Low-viscosity formula for excellent wet-out and penetration
• Exceptional adhesion to wood, fiberglass, composites and metals
• Outstanding moisture resistance
• Ideal for bonding, coating, laminating and structural repairs
• Compatible with WEST SYSTEM 205, 206, 207 and 209 Hardeners
• Easy to modify with WEST SYSTEM fillers for gap filling, fairing or structural bonding
• Minimal shrinkage during cure
• Suitable for professional and DIY marine applications

Typical Applications

• Boat building
• Yacht repair and maintenance
• Fiberglass repairs
• Composite construction
• Structural bonding
• Wood encapsulation
• Marine coatings
• Carbon fibre laminating
• Furniture manufacturing
• DIY composite projects

Why Choose WEST SYSTEM 105?

For decades, WEST SYSTEM has been considered one of the leading epoxy systems in the marine industry. Its outstanding bonding performance, predictable curing characteristics and long-term durability make it the preferred choice for professionals who require reliable structural repairs and premium finishes.

By purchasing the 105 Resin without hardener, you can select the curing speed that best matches your working conditions, reducing waste while achieving the best possible results for every project.

Technical Specifications