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ASSESSING DEW POINT IN EPOXY PROJECTS

Updated: Jun 25

Thinkin’ of Puttin’ Down a Floor in the Cold? Here’s What You Need to Know!

Temperature Range (°F)

Above 70°F

Yes, ideal conditions

60°F - 70°F

Yes, with some precautions

50°F - 60°F

Maybe, with significant precautions

Below 50°F

No, not recommended


Dew Point Considerations with Protective Coatings

Alright, here’s the deal. You gotta keep an eye on that dew point when you’re working on your project. It’s super important for making sure everything sticks together and cures right. Now, the dew point is when the air gets so full of moisture that it starts to condense on stuff. If you’re not careful, that moisture can mess up the bond between your materials, causing all sorts of problems. So, keep it dry and you’ll be golden!


Here's how you can assess the dew point in epoxy projects:


Factor

Assessment Method

Temperature and Humidity

Check the Weather: Use a hygrometer or a weather app to get the current temperature and humidity. To figure out the dew point, you can use an online dew point calculator or do the math yourself with this formula:

Dew point =

243.5∗ln⁡(Relative Humidity/100)17.62−ln⁡(Relative Humidity/100)17.62−ln(Relative Humidity/100)243.5∗ln(Relative Humidity/100)​


Just remember, Relative Humidity is a percentage.

Visual Cues

Keep an eye out for any moisture build-up on stuff like windows, metal surfaces, or even your own skin. That’s a sign that we’ve hit the dew point. Also, watch if your cold drink starts to sweat or if frost shows up on it in no time. That’s another clue.

Epoxy Compatibility

You gotta check out that datasheet for your product. It’ll tell you the best temperatures and humidity levels to work with. And don’t forget about that dew point, make sure it’s in the safe zone for your stuff. Got it?



  1. Check weather conditions: Before you get started on your project, make sure to check out the weather for the day and the next 24 hours. Keep an eye on the temperature and how humid it is, 'cause they’re gonna affect the dew point.

  2. Use a dew point calculator or meter: There are various tools available, such as handheld dew point meters or online calculators, that can help you determine the dew point based on the current temperature and relative humidity. These devices provide accurate readings and are easy to use.

  3. Surface temperature measurement: Use a surface temp probe to measure the temperature of the surface where you’re gonna do your project. Make sure that the surface temp is at least 3°C (5°F) higher than the dew point temperature you calculated. This difference in temperature, which we call the “dew point spread,” is super important to stop any condensation from forming on the surface while you’re working.

  4. Surface moisture testing: Additionally, it's a good practice to check for moisture on the surface. Perform a plastic sheet test or use moisture meters specifically designed for concrete or other substrates to detect any moisture that might be present. If significant moisture is detected, you must address the issue before proceeding with the epoxy application.

  5. Humidity control: If the weather conditions are close to the dew point, consider controlling the humidity in the application area. You can use dehumidifiers to reduce the moisture content in the air and prevent condensation on the surface.

  6. Acclimation: It’s super important to let the materials and the surface you’re working on get used to the environment before you start. Make sure they hang out in the same spot where you’re gonna apply them for long enough so they can get to the same temperature as everything else around them.


Alright, here’s the deal. You gotta keep a close eye on that dew point, alright? Don’t skip on the prep work either. Make sure everything’s nice and ready before you start. Know your surroundings, the weather, all that jazz. Do it right, and you’ll have yourself a top-notch, long-lasting coating that’s not going anywhere. No shortcuts, got it?

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