Ive only applied cassia once (henna gloss twice) and i agree with adding some kind of emulsifier like condish, menthi, etc... There will be grit no matter what so the goal is to get a brew going then make it a good texture to apply. I also second the application bottle i just got a new one that has a 3 angle tip on it and the spout is wide enough for henna gloss and cassia to get through. The typical dye bottles were too narrow for the grit but so far this one has been good to me.