Cars & Other Vehicles How long does South Seas spray tan last? How long does South Seas spray tan last? seven to ten days What brand of spray tan is the best? - Norvell Cosmo. - Sjolie Sunless #9 (Medium tone) - Tanfastic E Blend 8.5% Med. - Sjolie Sunless Violet Spray Tan Solution - LUXE No. ... - Sjolie Sunless Violet Spray Tan Solution - LUXE No. 9 - Light/Medium. Why spray tan is bad? Sunless tanning pills, which typically contain the color additive canthaxanthin, aren't safe. When taken in large amounts, canthaxanthin can turn your skin orange or brown and cause hives, liver damage and impaired vision.