I use a pH balancing spray on every single client I spray tan. I have tried not using it before, and the results are just not the same. I keep my pH balancing spray in a spray bottle and mist my clients head to toe, let it dry while I apply barrier cream, then preform the spray tan.
I've found that because the pH spray lowers the pH levels in the skin, you develop a much more golden brown color from the DHA spray tanning solution. It also helps the spray tan to fade more evenly, instead of becoming patchy. The spray I use even has a mild exfolient and adds moisture to the skin!