seriously !!
What you are describing is such a small amount of air escaping that dipping it in water will not cause those bubbles to float to the top like a normal big leak will.
I had custom made Boyd wheels made (many years ago)and I kept getting leaks. They could never find them. I told a buddy of mine that welds for a living and he found all of the leaks at the welds. Sometimes dirt ,old paint can help hold the air in a little. Scrub the rim inside and out really good. Look for the leak on the inside. You might not see bubbles float but maybe small foam forming in an area.
Good Luck !!!
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