System Three General Purpose Epoxy is our original product. It actually gave the company its name. From the founding of the company until just a few years ago it has been the workhorse of the product line. The system formulation, containing one resin and three curing agents or hardeners contains a significant amount of renewable materials. Long before "green” was in vogue the System Three General Purpose Epoxy System contained as much as 30% plant derived materials and has never contained any volatile organic compounds (VOC).
General Purpose Hardeners
General Purpose Resin is a versatile, all-around epoxy resin system used in both marine and woodworking applications. Three different hardeners offer performance across a broad spectrum of environmental conditions.
General Purpose Resin wets out fiberglass cloth very well and can be mixed with various fillers to create non-sagging adhesives, filleting and fairing compounds for marine applications.
• Economical without sacrificing performance
• Non-brittle, flexible film
• Combine with silica thickener to make a general duty adhesive
• Use with System Three Epoxy Pigment Concentrates for woodworking applications
• Features a convenient 2:1 mixing ratio
• 0 VOC
Minimum Application Temperature
Minimum Application Temperature:
Slow Hardener: 75°F(24°C)
Medium Hardener: 55°F(13°C)
Fast Hardener: 35°F(2°C)
Mix Ratio by Volume: 2:1
Mix Ratio By Weight: 100:44
General Purpose Epoxy is the product that started it all for System Three Resins in 1979. Our revolutionary formulation finally allowed users the flexibility to work in all environments. With three different hardeners, plus the ability to blend hardeners and create a custom curing profile, the possibilities with General Purpose are endless.
Our line has since expanded, but General Purpose Epoxy remains a staple to this day in wood shops and boatyards.
Mix General Purpose Epoxy with Silica Thickener to produce a structural non-sagging epoxy glue.
Finding the Right Hardener
No Matter what the conditions look like in your shop, General Purpose Epoxy is ready to serve.
Minimum Curing Temperatures:
#1 Fast Hardener: 35°F (2°C)
#2 Medium Hardener: 55°F (13°C)
#3 Slow Hardener: 75°F (24°C)
General Purpose Epoxy FAQ
The final properties of the cured General Purpose Epoxy will be equal no matter which General Purpose Hardener is used. Choose which hardener to use based on your working temperatures and desired working time. Here is a general guideline to follow.
#1 Fast Hardener: 35° F (2° C) to 60° F (15° C).
#2 Medium Hardener 60° F (15° C) to 80° F (26° C).
#3 Slow Hardener 80° F (26° C) and warmer.
Some epoxy resins are prone to blushing in cold and damp conditions. Blush is a greasy feeling surface feature that can occur when the epoxy reacts with atmospheric moisture as it is curing. Blush, being water soluble and strictly on the surface can easily be removed by washing the epoxy with warm soapy water after it has cured.
To avoid the extra step of removing any blush, some epoxy formulas are specifically formulated to be blush free in any conditions. Our blush free epoxy products are; SilverTip Epoxy, Clear Coat Epoxy, and Cold Cure Epoxy.
Homebrewing your own epoxy compounds instead of using the SilverTip line of ready-to-use epoxy compounds involves mixing various fillers into a mixed batch of one of our liquid epoxies. Below are some guidelines for creating common compounds using System Three General Purpose Epoxy, Cold Cure, SilverTip Epoxy, Clear Coat, and SB-112 Liquid epoxies.
1 cup of Silica Thickener to 6 oz of mixed epoxy.
3/4 cup of Wood Flour to 6 oz of mixed epoxy.
1/2 cup of Silica Thickener + cup of Glass Microspheres to 6 oz of mixed epoxy.
1 cup of Wood Flour to 6 oz of mixed epoxy.
3 cups of Glass Microspheres to 6 oz of mixed epoxy.
For further detail on mixing and applying compounds, please refer to the System Three Epoxy Book.