I really love the sharpie dye method(this one -
here- ), but I can't seem to find anything on dying skin-top wigs. Should I not use this method on a skin top? If I can, is there anything special I should do to prevent the "skin" from getting dyed? Or does it not dye it?
Also, the wig I'm planning on dyeing is already a light dishwater brown color. But I want it to be more auburn. Pretty much this to this:

-->

I'm thinking about using a few reds, browns, and maybe one black. I'm still no expert on color theory, so would that be good?
Thanks!