As of November 2014, once you receive a Zapper skin, this is unlocked in the skins section of the wardrobe. Curing is no longer required, and it can be removed and worn as you need.
Element Skins used to be cured using an Elemental Reversal Concoction.
Mystery Skins used to be cured using a Mystery Reversal Concoction.
Color Skins used to be cured using a Color Reversal Concoction.
Experiment Skins used to be cured using an Experimental Reversal Concoction.