Just got hold of a second set of UST wheels, but the rear has a small amount of scuffing around the edge of the rim (like it's been rolled along without a tyre on).
While one un-scuffed wheel is fine and holds air, the other scuffed wheel loses all pressure within 30mins from a Maxxis LUST tyre. It was seated using a lube and pumped up to 50psi - the spit test shows that it's actually coming out around the bead. I've yet to test it in the bath, but logic tells me that this is the case all around the bead - there were no obvious signs of one point of escape for the air.
I don't use Stan's at the moment on my other wheelset, but have considered the idea after repairing a few UST tyres and will be getting some soon.
However, do you think Stan's will seal this rim/tyre combo?