SPOTMYUV works with spray sunscreens, lotion sunscreens, roll-on & stick sunscreens, as well as gel sunscreens.For a sunscreen to work with SPOTMYUV, it must block UVA & UVB light - which you may see labelled on your sunscreen as being "broadband". The SPF scale only refers to the amount of UVB light being blocked, so you can quickly look for 3 ingredients to look for UVA coverage. On the label, look for Avobenzone*, Titanium Dioxide, or Zinc Oxide. Any one of those 3 indicates that you are getting sufficient UVA protection. If you have any questions about a specific sunscreen, please email info@suncayr.ca and we will get back to you!*Avobenzone may also be called Butyl Methoxydibenzoylmethane