Try to do your self-tanning early in the day. Then, after four hours, rinse off in the shower to remove just the temporary bronzer on the top layer of skin, says Fiona Stiles. If it's closer to bedtime, use a large makeup brush to lightly dust yourself with baby powder after the tanner has dried. "This forms a barrier that prevents slip-off but won't alter your hue," says Suvara Spray Tanning guru Anna Stankiewicz.
Johnson's baby powder, $4/15 oz.; at drugstores.Read MoreLess