In my experience, semi and Demi permanent colors seem not to "wash out" as they're supposed to, but instead change into funky colors on gray hair. I think that's why most people with a lot of gray use permanent instead. I've read on gray boards that the Demi color never washes out, so all you're doing is extending the time it will take to transition. For me, the choice was easy; get it over with as quickly as possible. Cold turkey.
2C/ Coarse/ Normal porosity/ SW Florida/ Salt & Pepper
Cleanse: AIA cowash, TJ Tea Tree Condish
Condish: JC Too Shea, Tresemme Botanique
Stylers: flax/okra gel or KCCC + CJ PP or JC Spiralicious
Experimenting with Got2B Ultra gel and loving it so far!