I pulled the car up and he pulled the tire off lickitysplit. He sprayed water on it and misted it with a soapy solution. Nothing. No bubbles. I mentioned the slowness of the leak again and he filled a tub with water and a little soap. We both looked but nothing showed. “Sometimes these slow ones take awhile” mused the rangy, wrinkled tire guy. After patiently turning and misting the tire for a few more minutes “there it is” he says. I looked where he was pointing and finally I could pick out the tiniest little bubble forming. Good eyes. He marked the location of the leak and the tire weights and started removing the tire from the rim.