Paintings, Coatings, and Application: Why Humidity and Dewpoint Matters

Paintings, Coatings, and Application: Why Humidity and Dewpoint Matters

Whether you’re painting a bedroom or the exterior of a house, you’re likely most concerned about the color you’re choosing from the hardware store. You go and buy supplies like a paintbrush and roller and head home to get started. While most don’t make a connection between humidity, dew point, and paint, understanding this relationship can help you get better results.

Why Does Humidity and Dew Point Matter with Painting?

Condensation can impact the application of paint and how long it takes to dry. You should also be mindful of the material that you’re painting since different types of materials will absorb moisture differently.

For example, painting wood siding or a wood fence when it’s damp will yield less-than-desirable results. That’s because wood absorbs moisture, even from humidity.

Consider Drying Times

Carrying on with the wood example, you’ll need several sunny and even windy days to allow the surface to fully dry. Water must evaporate at a faster rate than the solvents in the paint. If humidity and moisture interfere with the paint drying, the paint won’t be able to cure itself and harden on the surface.

Keep in in mind that the solution is not to simply use oil-based paints. You will encounter the same results with humidity and dewpoint issues that you will with water-based latex paints.

If you are painting inside of your home, you can use climate-controlled appliances to help improve conditions. An HVAC system, window air conditioner, or even baseboard heater will help balance humidity and dewpoint levels for best interior painting conditions. You may also use a humidifier or dehumidifier depending on the conditions.

Measuring Humidity and Dewpoint

A device such as Kestrel Weather Meters can help you track humidity and dewpoint inside and outside of the home. The following chart outlines the humidity and dewpoint guide for painting and application conditions:


Measuring Humidity and Dewpoint

The Kestrel Weather Meter displays accurate and down-to-the-minute readings of humidity and dewpoint. This can help ensure that you are painting in the best conditions possible. If you are painting outside, it can provide insight on wind direction and wind speed that can aid in drying surfaces or even drying paint. You can also use it to track impending weather conditions such as rain.

Use Kestrel Weather Meters for Humidity and Dewpoint Tracking

Kestrel Weather Meters can help improve your painting experience by tracking humidity and dewpoint. Above all else, be sure that surfaces are completely dry before painting whether you are working inside or outside of a climate-controlled environment.

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