Industry Experts

Spray Booths

Introduction

Why is humidity control important to Spray Booths?

Spray booths are often used for water-based paints and frequently require relative humidity levels as high as 65-75% in order to deliver consistent spray quality. Optimising RH helps prevent aerosol evaporation, pigment agglomeration and premature drying, and ensures consistent deposition rates.

The objective of humidifying a paint spray booth is to permit the optimum transfer of paint from the spray guns to the bodywork, without any loss into the atmosphere of the water-based paint itself. When the relative humidity level drops below 30%, problems begin to arise, one of which is the simple fact that paint dries increasingly fast at this level.
Spray Booths

Products

Spray Booths

Benefits

Water-based paints require a high relative humidity of 65% to 75%. If the air drops below 30%, the paint mist evaporates rapidly between the nozzle and the target, causing paint to be lost into the atmosphere rather than bonding smoothly with the bodywork.

Low humidity forces paint to dry too quickly and unevenly, which causes pigment clustering and poor deposition rates. Keeping humidity levels tightly controlled prevents these premature drying defects, significantly improving the finish quality and lowering overall paint costs.

Dry air triggers static build-up, which acts like a magnet for airborne dust particles, pulling them straight onto freshly painted surfaces. Maintaining correct humidity levels eliminates this static charge, keeping the booth clean and ensuring optimal conditions for electrostatic paint application.

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