I gave up on it. I can get good volume but too many gray hairs coming in wavy or straight, like I'm turning into a white man or something. shyt is offensive to me brehs. I'm tired of my girl saying it looks like someone took Rick Fox's hair and stuck it on my chin.
I bought a beard pen on Amazon, its supposed to fill in gaps/ patchiness but it actually works really well for covering white/ gray hairs. just pencil over them and they look dark, lasts most of the day too unless you try to wash it off
its a "band aid", so if you have a lot of gray hairs then the pen is probably not sustainable. but for me, and having a few white hairs, but they are noticeable, it really does the trick and its cheap too. much easier than dying