Home / Resources & Training / Tips of the Trade / How to Spray Properly When It's Freezing Cold How to Spray Properly When It's Freezing Cold Posted in Painting & Coating Tip: #40 The answer is: Use Heat! By applying heat we reduce the viscosity of the paint. Viscosity is effectively the “thickness” of the paint and this is affected by temperature. Generally the higher the viscosity of the paint, the more film build you can achieve per coat of paint. The most common solution is to use a high pressure fluid Viscon Heater. Utilizing heat can have other benefits besides just being able to spray in cold weather. Contractors often find that they are able to spray heavier (higher viscosity) coatings without needing to thin the paint, increasing their transfer rate. Ambient temperature based on 21*C. Typical temperature drop in fluid lines. Effect of Temperature on Viscosity Maximum Temperature Rise vs Flow Rate 4000W Viscon HP Heater with test fluid: 10W Hydraulic Oil 2300W Viscon HP Heater with test fluid: 10W Hydraulic Oil More handy paint heating tips: Insulate your hose from the pump heater to the gun Use a heated hose kit to keep your product warm as it travels to your gun Use a drum blanket for wrapping a 208 litre drum Use a rigid metal band heater for a 19 litre pail Use a 208 litre drum plate heater Store paint and spray equipment in a heated building/room Tip: #40 Share this Download pdf Related Links > How to Know if the Atmospheric Conditions are Right for Painting > Is Your Airless Hose Blocked or Restricted?