How Humidity and Temperature Affect Epoxy Resin (And How to Keep Your Pour from Going Sideways)

Working with epoxy resin? Then you need to know this: temperature and humidity can make or break your project. Too cold, and your resin won't cure. Too hot, and it might overheat. Too humid? Say hello to cloudiness, sticky surfaces, or that dreaded amine blush. 

Here's what you really need to know: 

Temperature: The Cure-Time Boss

Ideal Range: 75-85F (24-29C).

Too Cold (Below 70F)?

• Slows curing or stops it entirely.
• Causes cloudy finishes or a soft, waxy surface.

Too Hot (Over 85F)?

• Can trigger a "flash cure" (cures too fast).
• Leads to yellowing, cracking, and lost working time. 

Fix it: Warm your resin before pouring (sealed bottles in a warm water bath) and use a space heater or heat mat if needed. Skip the garage in January. 

Humidity: The Silent Saboteur

Ideal Range: Under 60% RH (relative humidity).

High Humidity (Over 80%) Can Cause: 

• Amine blush (a greasy film that messes with finishes).
• Sticky or cloudy surfaces - even after curing. 

Fix it: Run a dehumidifier. If blush happens, wash the surface with soapy water and dry before sanding or recoating. 

Quick Tips for Perfect Pours

• Monitor your space with a thermometer and hygrometer.
  
• Warm your resin if it's cold.
• Work in climate controlled spaces if possible. 
• Avoid pouring during major weather events like heat waves or cold snaps. 

Epoxy resin is moody. Keep it happy by controlling the temp and humidity. Want a flawless finish? Create a consistent, climate-friendly workspace - and don't skip the prep. 

For resin that behaves beautifully even when the weather doesn't, check out our epoxy line up. We make stuff that's a little more forgiving - so you can focus on making cool things, bot battling the atmosphere.