What is the working temperature for this product? And does humidity affect the mixture?

The ideal working temperature is 65-75°F in a clean, dry, dust-free environment.

Epoxy resins are affected by temperature and humidity – so the cooler and drier your work area is – the better the results. Avoid working in high humidity. If you are pouring in large volumes of 2 or more gallons, we suggest keeping the room temperature closer to 65°F. We highly recommend keeping fans on your project to help dissipate the heat.