Without the rim strip, running tube tires on tubeless wheels is going to be sketchy. UST wheels seal the bead on the inside walls of the rim...stans system seals the bead with the bottom edge of the tire and the inside wall of the rim (to the sides of the spoke holes.) You may have a problem rolling tires...
As far as the sealent working for leaks, it'll have no problem. When I initially inflate my Python Air Lites, the sealent will bubble out all over the tire (looks like a rabid dog) and everything is sealed within a few seconds. Once the sealent has found all the leaks, they're air tight.
Pretty cool system
