I use them on clean skin with a light dusting of powder on top for daytime running around. I also use them over my foundation, and they don't slip at all .. for longer lasting wear, I will put a coordinating or totally opposite shade of powder blush on top to set the ccb... i.e. Tickle me Pink with Sweetness blush, or Tickle me Pink with Style blush, or Blushbaby. My skin is normal, and I live in a mostly hot climate -- and when I travel, CCb's are all I wear on my face cause airplanes will prune you up really quickly. I use them on my face as well as my lips either as a lippie or as a base for a ls or for altering/changing/ adding on to the tube colour.
You don't have rules with makeup and art -- just do what you feel like doing at that moment cause it will change the next day.