I use white, or gray Magic Sculpt to fill holes, easy colors to paint over. For me flesh tones just requires multiple coats to look right, but in other instances with this issue, I paint a clear coat over it, or some other color like white first, and the paint sets better. When it comes to skin tones instead of buying flesh colored paint I've just been mixing my own skin tones, and have had more success with that covering, well covers in 2 coats, instead of 3-5.