I would add water base as the primary feature, especially as I am getting samples for the next generation C-6 solvent fluorochemical. The raw is made with T-butyl acetate and in low VOC states the carrier will be T-butyl acetate (VOC exempt). There is no loss in performance, but the odor is overwhelming and the flash point is no longer 120 degrees F, but around 60 degrees F. I cannot imagine the odor when it is put on an entire floor, plus the need to turn off all gas pilot lights during application and turning them on after the odor has dissipated. It does dry really fast and for upholstery may be doable if you apply it outside on the patio.
You can make a case for the need of a solvent protector for upholstery as a water based can cause shrinkage or puckering for some high end fabrics. What is the performance case for using a solvent instead of a water base on a hard surface? Efflorescence can be an issue for colored grout, but some water based are designed to limit it. My point is that the next generation solvent based protector has two significant issues that the current versions do not. Any decisions made today will have to be re-evaluated once current supplies run out.
