When selecting the temperature for your paint booth, how do you know what the correct temperature setting is? Selecting the correct temperature settings for paint booths can be tricky. Here is a short guide on how to correctly set the temperature in your paint booth:
Ideal Spraying Temperature
In the automotive industry, it is no secret that increased throughput equates to increased profit. That is why proper temperature settings for paint spraying are so important.
For waterborne paint, the recommended booth temperature is between 70 and 75 degrees, or 5 degrees above ambient temperature, whichever is greater.
“For instance, if it is 90 degrees in Houston when you are painting, you should set your booth’s temperature at 95,” said Jason Garfoot, senior technical advisor for Global Finishing Solutions (GFS). “That will cause the burner to intermittently turn on, burning the humidity out of the air. This allows waterborne paint to dry about twice as fast.”
When using solvent-based paint, it is critical to not exceed ambient temperature.
“If it is 90 degrees outside, you want to keep the temperature of the booth at 90 when using solvent-based paint. You should also select a slower hardener and reducer for that temperature. You do not want the burner kicking on,” Garfoot advises. “The paint is going to naturally dry fast. If you accelerate the process too much, the paint will dry too quickly — causing problems such as splotchy paint, adhesion issues or dirty paint jobs for base coats, and brittle, hazy or dull clear coats.”
Ideal Paint Curing Temperature
For automotive paint with a catalyst to dry, a paint booth must be a minimum of 55 degrees Fahrenheit. For automotive paint booths with an air heater, the rule of thumb is that for every 15-degree increment above 70 degrees, a coating will cure about twice as fast (assuming 50 percent relative humidity). Similarly, for every 15 degrees below 70 degrees, a coating will take about twice as long to cure.
When curing in a non-heated paint booth, the amount of heated air exhausted from a heated building matters — especially during the cooler winter days in Texas. For instance, if the outside temperature is 40 degrees, and your shop has 150,000 cubic feet of heated air, a non-heated booth at 12,000 cubic feet per minute (CFM) will exhaust all of the shop’s heated air in only 12.5 minutes, making it necessary for the building’s heat system to replace it.
When setting the temperature in a paint booth, it is best to following the booth manufacturer’s recommendations. And at GFS, our service does not end at the point of sale. We are always ready to assist our customers with questions about paint booth temperature settings.