Ooookay... moving on...
Silly question- what are you using for the "gray" -paint, gray makeup, etc...
That I'm still trying to find out--since apparently not all makeup works on both latex prosthetics AND skin. And a color-matching problem is not something I'm particularly eager to experience.
I think I'm going to go for a very pale variant on Cardassian complexion, kind of like Garak. That'll hopefully allow me to use the same kind of makeup used for "undead" type looks...which I HOPE will make it easier to find something suitable since that's a more common costume.