Self-tan allows you to achieve a sun-kissed glow without subjecting your skin to harmful UV rays. Active ingredients in the self-tan turn the top layers of your skin to a golden colour. That is why you need to allow a few hours before rinsing off the product, to allow time for the change to occur. The top layers of skin naturally flake away over the course for the next 5 to 7 days, and the tanning effect of the product will no longer be visible. Self-tan needs to be reapplied to maintain the result.