The regular solution is designed to be left on the skin for at least 8-10 hours to develop before rinsing off. They will have a full tan however final color will continue to develop over the next 24 hours.
The rapid tan is a formulation for convenience that will allow the client to rinse off in 1-4 hours depending on the darkness wanting to be achieved. *Full color with a rapid tan will not be seen on the skin immediately after the initial rinse. In fact the client might not see any color or it can be very faint. It is crucial that you advise then that the full color will continue to develop over the next 12 hours with final color darkness at 24 hours after spray.