[villagetinker]

OP, If you have not already talked to the garage that mounted your tires, ask them about a sealant. I had the same problem on my Chrysler Sebring convertible (2000). In that case, the moisture would get into the rim area next to the tire, and eventually cause corrosion which resulted in the air loss. As I recall the tire dealer carefully cleaned the rims, and used a sealant, this good for a year or so. In my case, I was told this was a known problem with the Chrysler wheels, you may have the same problem with the golf cart wheels, and being much smaller, they lose air pressure a lot faster. Hope this helps.