Originally Posted by DiabloScott
There are some kinds of sealants that allow injection through the valve - Seal & Flate, Pit Stop, Presta Seal... in my experience, they don't work as well as Slime or <maybe> Tufo sealant.
No experience with those others, only Tufo which was recommended to me and my LBS stocks it ... they could be as good or better than Tufo, no idea.