Waterborne basecoat is susceptible to freezing when temperatures drop below 0° C / 32° F. However, it doesn't have to be frozen completely solid to affect its performance.

If a waterborne toner has experienced multiple freeze/thaw cycles, the first thing you may notice is that it remains "chunky" after normal hand agitation. You may also notice some water separation when pouring the toner from the bottle. Either of these conditions are not normal and you should be on alert during the mixing process. Even though moderate to excessive stirring of these toners can appear normal, the mixed color may still present unacceptable application through the appearance of surface defects and poor metallic control.

Toners that have been frozen should be replaced with fresh material to ensure the best color and appearance. Store toners in a moderately heated mix room and rotate your stock to ensure the best color match possible.