105 Epoxy Resin

105 Resin
105 Resin

105 Epoxy Resin® is the base material on which all WEST SYSTEM 105 System epoxy compounds are built. The resin is a 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.

105 Resin is formulated without volatile solvents and does not shrink after curing. It has a relatively high flash point and no strong solvent odor, making it safer to work with than polyester or vinylester resins. Resin viscosity is approximately 1000 centipoise (cp) at 72 F (22C),

105 Resin is 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. An excellent adhesive, 105 mixtures will bridge gaps and fill voids when modified with WEST SYSTEM fillers and can be sanded and shaped when cured. With roller applications, it has excellent thin-film characteristics to flow out and self-level without “fisheyeing.” 105 Resin/207 Special Clear Hardener mixtures cure clear so you can achieve a natural finish when coating with varnish.

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

Handy Repair Pack
101 Handy Repair Pack

105-K Fiberglass Boat Repair Kit

105-A Resin, 1 qt
105-A Resin, 1 qt

105 Resin
105-B Resin, .98 gal

105-C Resin, 4.35 gal
105-C Resin, 4.35 gal

105-E Resin
105-E Resin, 52.03 gal


WEST SYSTEM Epoxy resin and hardeners are packaged in three “Group Sizes.” For each container size of resin, there is a corresponding sized container of hardener. When purchasing resin ad hardener, be sure both containers are labeled with the same Group Size letter (A, B, C or E).


Coating Quantity – How Much Epoxy Do I need?

Estimating Coverage for Fabric Application

Storage & Shelf Life

105 Epoxy Resin Safety Data