The grout stick has worked well for water base. I won't be using water base again though. Last time I'm done sealing about 500sft. I come back to the beginning and it was all freakin white. Had to reclean and of course couldn't charge for the sealer that I had to clean off. What a pita. I call manufacturer and get no response. Next day, no response even. I call again and the guy doesn't seem to have a clue. Or he knows that the product is a pos and has not much to say. Joke. On the other hand Mikey responds within the hour. I'll bring him a bag of broccoli next MF.
Solvent based for now on. Like it's been said the grout stick will leak with solvent so buy extras until the manuf. figures it out.
Albert