Grey MESS! Pls help.

The hair isn't really light enough for anything but a very dark grey. The bits were it has stuck are either lighter and/or more porous so soaked up more dye. I've not used that dye, but it looks very light to me from a google search, so diluting it would certainly make it too weak for hair  that dark, even though it's pretty light. I would suggest doing a bleach bath to lift it another level or two and then try it undiluted, or at least, only diluted a little.

The hair isn't really light enough for anything but a very dark grey. The bits were it has stuck are either lighter and/or more porous so soaked up more dye. I've not used that dye, but it looks very light to me from a google search, so diluting it would certainly make it too weak for hair  that dark, even though it's pretty light. I would suggest doing a bleach bath to lift it another level or two and then try it undiluted, or at least, only diluted a little.

Do I need to wait for the grey to fade before doing a bleach bath? Thanks so much!

I would give it a couple of really good shampoos first to get rid of a lot of it, but it should be fine. Try as much as you can to keep it off the parts that are already grey though, you need to try and even up the colour a bit. 🙂