You use setting powder for your makeup, why wouldn't you for your tan! 
 
Tired of feeling sticky after applying self tanner? 
 
Setting powders eliminate the post spray tan sticky feeling. It dries and helps protect and set the sunless tan while it is developing. Picky from a variety of scented powders, this also serves as an odor neutralizer helping your skin feel silky soft and has a beautiful shimmer.
 
Does your tan fade in a lot quicker in certain areas like cleavage and under arms? Dust some setting powder on those areas throughout the day to help absorb extra moisture! This is also a great product to use as perfume or in between deodorant applications.