Re: Rim balance and using slime
I would guess that as long as it does not dry out it would balance the tires.
I use Equal which is a tire balancing compound in my motorhome tires and there is a similar product out called Dyna Beads that does the same thing. Equal is more like a powder that distributes evenly as the vehicle rolls.
Slime is a bit thick though and I assume it will settle when parked and take a bit longer to distribute when your bike gets rolling.