Here is a website with more information about epoxy curing. Tom is right about temperature...
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entropyresins.com]
Epoxy Temperature and Curing
The warmer the temperature of curing epoxy, the faster it cures. Three things contribute to epoxy’s temperature:
The general surrounding temperature of your work area, or ambient temperature.
The temperature of the surface you’ve applied the epoxy to, which is also a part of ambient temperature.
The heat the epoxy generates as it cures, or exothermic heat.
To adapt to warmer temperatures, use a slower hardener to increase or maintain your open time. You can also mix smaller batches and use them up quickly. Or pour the epoxy mixture into a container with greater surface area (such as a roller pan) to allow exothermic heat to dissipate, extending open time. The sooner the mixture is transferred or applied (after thorough mixing), the longer the mixture’s available open time for coating, lay-up, or assembly.
In cool conditions, use a faster hardener or use supplemental heat to raise the epoxy temperature above the hardener’s minimum recommended application temperature. Use a hot air gun, a heat lamp, or another heat source to warm the resin – before mixing or after the epoxy is applied. Do not heat hardeners prior to mixing with resins. You can speed the epoxy cure time by applying supplemental heat to the curing epoxy.
Edited 1 time(s). Last edit at 06/07/2021 11:06AM by Kent Griffith.
