I find myself mixing foundations lately. Sometimes if a colour is just a tad too light or too dark I don't return it and will mix it with another to get the "right" shade. I find that I can customize better this way as it seems pretty much impossible to get the exact right shade for my skin unless it is very sheer. Plus between summer and winter my skin colour changes! I also mix foundations to get different finishes, like radiant or satin.
Do you mix foundations?
MUA's + beauty experts is this a good idea?