The cream you use to block the spray on tan needs to be applied with precision. Twice I have gotten too much "tan" on my fingers and it looked uneven. It would not wash off, so over time it wore off. In the mean time, my hands looked dirty.
The place where I went provides a salt scrub that you use on the palms of your hands, the soles of your feet and your cuticles immediately upon exiting the spray-on booth (after you've done the buffing procedure I described previously.) The salt scrub takes off the tanning solution before it has time to set. Bradford P.S. I have now done this twice as this thread reminded me that I still had one session left on my trial offer. Both times I would say that it has worked quite well.