Originally Posted by slick94prix
Originally Posted by imidazol
There are some rims like aluminum that can have porous areas which allow air to seep. That'* what I was looking for with the water test as well.
Crap, I knew I was forgetting something
Aluminum rims are notorious for this. The porous metal gets worse over time, allowing more and more air to escape.
I have chrome-plated wheels over aluminum and I suspect a seep into the chrome plating on top of the rim between the beads on one. I read that the chrome goes on there but the wheel isn't prepped so the chrome doesn't stick as well. Don't know if that'* true or not.
As for finding slow seeps I've used puddles in a parking lot and dish detergent to coat a tire and look for leaks when the tread is in the low end with the weight of the car flexing the rubber.
Seeps at the bead where aluminum has oxidized probably seep only as they flex when the weight moves onto them and then off. But they don't seep while stationary.