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ASSESSING DEW POINT IN EPOXY PROJECTS

Updated: Jan 23

Can I install an epoxy floor in colder weather?

Temperature Range (°F)

Can I Install Epoxy Floor?

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

Assessing the dew point is crucial in epoxy projects to ensure proper adhesion and curing of the epoxy coating or adhesive. The dew point is the temperature at which the air becomes saturated with moisture, causing condensation to form on surfaces. In epoxy applications, moisture can negatively impact the bond between the epoxy and the substrate, leading to adhesion failure and other issues.


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


Factor

Assessment Method

Temperature and Humidity

Use a hygrometer or a weather app to measure the current temperature and humidity. Calculate the dew point using an online dew point calculator or the following formula: Dew point = (243.5 * ln(Relative Humidity / 100)) / (17.62 - ln(Relative Humidity / 100)) where Relative Humidity is a percentage value.

Visual Cues

Look for condensation forming on surfaces like glass, metal, or even your skin. This indicates that the dew point has been reached. Observe if cold drinks sweat or frost forms on them quickly.

Epoxy Compatibility

Check the epoxy product's technical datasheet for the minimum and maximum recommended application temperatures and humidity levels. Ensure the dew point falls within the safe range for your chosen epoxy.


  1. Check weather conditions: Before starting your epoxy project, check the weather forecast for the day and the following 24 hours. Pay attention to the temperature and relative humidity levels, as they are directly related to 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: Measure the temperature of the surface where you plan to apply the epoxy using a surface temperature probe. Ensure that the surface temperature is at least 3°C (5°F) above the calculated dew point temperature. This temperature difference, known as the "dew point spread," is essential to prevent condensation on the surface during application.

  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 essential to allow the epoxy materials and the substrate to acclimate to the environment before application. Keep them in the area where the epoxy will be applied for a sufficient amount of time to ensure they reach the same temperature as the surroundings.


By carefully assessing the dew point and taking necessary precautions, you can ensure a successful epoxy project with excellent adhesion and curing properties. Proper surface preparation and understanding the environmental conditions are essential to achieve a long-lasting and durable epoxy coating or adhesive bond.

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