105 Epoxy Resin is the base material on which all WEST SYSTEM 105 System epoxy compounds are built. It is a clear, pale yellow, low-viscosity liquid epoxy resin. Blended with hardener at the proper ratio, it cures to a hard, solid plastic with superior physical properties.

Based on which hardener you choose, it cures at a wide range of temperatures.  Once cured, it forms a high-strength solid that is functionally waterproof, and highly resistant to moisture vapor. Designed to wet out and bond with wood fiber, fiberglass, and reinforcing fabrics. It also bonds well with a variety of metals.

105 Epoxy Resin (and its corresponding hardeners) are formulated without volatile solvents. Unlike polyester or vinylester resins, there is virtually no shrink after curing. With a relatively high flash point and no solvent odor, it’s safer to use than styrenated resins.

Modifying this epoxy with WEST SYSTEM fillers creates an excellent structural adhesive or fairing compound. Choose the filler that suits your project. Epoxy thickened with adhesive (high-density) fillers makes structural bonds, bridges gaps, and fills voids. Epoxy thickened with fairing (low-density) fillers is easily sanded and shaped after it cures.

This epoxy is also a great coating material.  Applied with a roller, it offers excellent thin-film characteristics. It will flow out and self-level without “fisheyeing.” By combining it with blush-free 207 Special Clear Hardener, you can create a natural finish. Add a couple of coats of varnish for UV protection. This is a good alternative that builds mil thickness quickly, saving time and effort. The results are long-lasting.

105 Resin’s viscosity is approximately 1000 centipoise (cp) at 72 F (22C).

Pair 105 Epoxy with corresponding letter size of 205 Fast Hardener, 206 Slow Hardener, 209 Extra Slow Hardener or 207 Special Clear Hardener.