West System 105B Epoxy Resin .98 Gallon

The resin is a clear, light-amber, low viscosity liquid epoxy resin. It is a formulated resin designed specifically to wet-out and bond with wood fiber, fiberglass, and a variety of metals. With roller application, it has excellent thin-film characteristics in flow out and self-leveling, without fish-eyeing. It can be cured in a wide temperature-range, and can be sanded and shaped afterwards. The resin cures quite clear so that you can achieve a natural finish by coating with varnish. It has a relatively high flash point, which makes it safer to work with than polyesters. Makes an excellent adhesive when mixed with West System fillers to reduce sag and bridge voids. Viscosity is approximately 600 cps at 70 degrees F. Order optional #301 mini pumps for accurate, easy dispensing.Size: 0.98 Gallon (3.74 L).105,105B,105-B


  • Clear, pale yellow, low-viscosity liquid epoxy resin
  • Formulated for use with West System hardeners, it can be cured in a wide temperature range to form a high-strength solid with excellent moisture resistance
  • Contains no volatile solvents and does not shrink after curing
  • Has a relatively high flash point and no strong solvent odor, making it safer to work with than polyester or vinylester resins
  • Designed specifically to wet out and bond with wood fiber, fiberglass, reinforcing fabrics and a variety of metals when mixed at the proper ratio with a West System hardener
  • Excellent adhesive, will bridge gaps and fill voids when modified with West System fillers
  • Can be sanded and shaped when cured
  • With roller applications, has excellent thin-film characteristics to flow out and self-level without "fisheyeing"
  • Resin viscosity approximately 1000 cps at 72°F (22°C)

* Dispensing and Mixing

  • Dispense the proper proportions of resin and hardener into a clean plastic, metal or wax-free paper container
  • Don't use glass or foam containers because of the potential danger from exothermic heat buildup
  • DO NOT attempt to adjust the epoxy cure time by altering the mix ratio
    • An accurate ratio is essential for a proper cure and full development of physical properties
  • Dispensing with Mini pumps
      • Most problems related to curing of the epoxy can be traced to the wrong ratio of resin and hardener
      • To simplify metering, we recommend using calibrated WEST SYSTEM Mini Pumps to dispense the resin and hardener
      • Mini Pumps are calibrated to deliver the proper working ratio of resin to hardener
      • Pump one full pump stroke of resin for each one full pump stroke of hardener
      • Depress each pump head fully and allow the head to come completely back to the top before beginning the next stroke
    • Partial strokes will give the wrong ratio
    • Read the pump instructions before using pumps
    • Before you use the first mixture on a project, verify the proper ratio according to the instructions that come with the pumps
    • Re-check the ratio anytime you experience problems with curing
  • Dispensing without Mini Pumps (Weight/volume measure):
    • To measure 105 Resin and 205 or 206 Hardener by weight or volume, combine five parts resin with one part hardener
    • To measure 105 Resin and 207 or 209 Hardener by volume, combine three parts resin with one part hardener (by weight, 3.5 parts resin-1 part hardener)

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