WEST SYSTEM Epoxy Resin - 4ltr

WEST SYSTEM 105 Epoxy Resin: The Trusted Foundation for Strong, Lasting Bonds

Ever finished a laminated panel or a boat repair, then lay awake wondering if the joint will really hold? A weak or brittle bond can undo hours of careful work and let you down where it matters most. WEST SYSTEM 105 Epoxy Resin gives you the confidence to build it once and build it right. This low viscosity resin wets out and bonds beautifully with timber, fibreglass and metal, curing to a high-strength solid with excellent moisture resistance.

As the base of the entire WEST SYSTEM 105 range, it's the reliable starting point for coating, bonding and laminating. Mix it with the right hardener, and you get a dependable bond you can fill, sand and shape with ease.

Key Features

• Low viscosity flow: The thin, clear to pale yellow resin soaks into timber fibre, fibreglass and reinforcing fabrics, so you get thorough wet-out and a stronger bond every time.
• Excellent moisture resistance: Cures to a high-strength solid that stands up to damp conditions, making it a trusted choice for boat building and outdoor projects.
• No shrinkage after curing: The resin holds its shape as it sets, so your joints and coatings stay true without pulling or distorting.
• Solvent-free formulation: Made without volatile solvents, so it won't shrink or off-gas the way many polyesters do, giving you a cleaner, more predictable result.
• Safer to work with: A relatively high flash point and no strong solvent odour make it more pleasant and safer to handle than polyester resins.
• Versatile bonding: Wets out and bonds with wood fibre, fibreglass, reinforcing fabrics and a variety of metals when mixed at the correct ratio.
• Fills and shapes: Combine with WEST SYSTEM fillers to bridge gaps and fill voids, then sand and shape the cured surface to suit your work.

Ideal For

• Boat builders bonding, coating and laminating hulls and fittings.
• Furniture makers and woodworkers after a strong, moisture-resistant glue-up.
• Fibreglass and reinforcing fabric layups that need thorough wet-out.
• Gap-filling and void-bridging repairs where a sandable, shapeable bond matters.

Specifications

• Type: Clear to pale yellow, low viscosity liquid epoxy resin.
• Role: Base resin for the WEST SYSTEM 105 system.
• Bonds with: Wood fibre, fibreglass, reinforcing fabrics and a variety of metals.
• Cured properties: High-strength solid with excellent moisture resistance and no shrinkage.
• Formulation: No volatile solvents, high flash point, no strong solvent odour.
• Cure range: Cures across a wide range of temperatures with WEST SYSTEM hardeners.
• Mix ratio with Fast Hardener 205 or Slow Hardener 206: 5 parts resin to 1 part hardener.
• Mix ratio with Clear Hardener 207: 3 parts resin to 1 part hardener.

A quick tip: always measure resin and hardener at the exact ratio for your chosen hardener, whether that's 5:1 with 205 or 206, or 3:1 with 207. Getting the ratio right is what gives you a full, reliable cure, so lean on accurate pumps or scales rather than guessing by eye. Then mix thoroughly, scraping the sides and bottom of your pot before you spread or bond.

Ready to build strong, lasting bonds you can rely on? Add WEST SYSTEM 105 Epoxy Resin to your cart today and craft with confidence.