It’s always best to be free of make-up and foundation before you have a spray tan.
Be careful though if you decide to remove your make-up or foundation just before you about to have a spray tan. Wipes and removers can contain oil, which left on the skin will cause your tan to run a bit, so it’s best to avoid this.
I always suggest soap and a good wipe over with water and a good scrub with a towel.
Having a spray tan at home really in a convenient way to have a spray tan, especially if you are shy going out to a salon to have a spray tan with any make-up on.