SPOTMYUV UV Detection Stickers for Sunscreen with Patented DERMATRUE SPF Sensing Technology | KNOW WHEN TO REAPPLY SUNSCREEN TO HELP PREVENT SUNBURN - 48 Count

Just used this product on a recent trip to Florida. I made sure to wash my skin before application and it lasted about 2 days on my skin without coming off. When out of the sun or behind uv glass, like in a car, the spot turns clear. As soon as you step into the sun it turns purple. If you use a sunblock it starts to become clear or semi clear. After being on the beach and having gone into the water a few times the spot started seeing purple and I applied sunblock again. In a minute the spot was clear again. So this is very effective In alerting me when to reapply.

These are amazing! The UV detection stickers adhere to your skin and are barely noticeable until they turn purple, telling you it's time to reapply. When I first put one on, I wasn't sure why it was bright purple and wasn't changing color. What I didn't realize, and I hope you won't make the same mistake, is that you needed to cover them sticker in sunscreen. So, apply the detection sticker first and then apply your sunscreen.

If you're like me and in a love-hate relationship with the sun after multiple brushes with melanoma and other skin conditions...then these are for you. I put them on myself and my family and they really work! Good reminder to reapply when you're at the beach or outside for long periods in the UV rays. I removed a star because they can leave a sticky film or even come off, but between 3 or 4 of us wearing them we always have at least 1 or 2 to check for reapplication reminders.

I like the concept, I agree the instructions on the package are subpar.. but I'm most upset that it left a "tan" circle on my son's arm .. and not just an outline but a full mark from where it was put on his arm

These don't work. I bought a pack of them to use on vacation. I followed the instructions when applying my spf 70 but the sticker never turned clear, just light purple. The sticker also didn't get darker during the hour and get I had it on. Luckily I was paying attention to the time and know when I needed to reapply my sunscreen so I didn't get burned.While the sticker don't work in the run, if you leave them out of the package under your kitchen table light at night they will turn clear.

Where have these been all my life?! I'm very fair skinned, and I burn easily. I use sunscreen every day, no matter what, and I use a lot in the summer, but these will let me know I need to reapply before I get into the danger zone. They stick on easily, stay on well, and remove easily without leaving residue. I put mine on my wrist or forearm, where I frequently get sun exposure and can see it easily. It is definitely noticeable when it turns the warning color, which is a reddish purple. One kid thought it was a bruise until I took off the sticker. They are kind of expensive, but worth it to prevent a painful burn. I'm going to order more.

Once I learned the trick to applying these, I love them.I apply it, then completely cover the dot in sunscreen and let that sit for 30-60 seconds. Only then do I rub in the sunscreen (and I apply sunscreen to that arm at that time). As immediately as I can, I then step in to direct sunlight. (I’m planning on testing if a UV flashlight works on the next cloudy day that I use these)I have to stand in the sun for several minutes, but the sticker will gradually turn clear.Once it’s clear I can go back and forth between sun, shade, and indoors.For me they stay on pretty well, even through sweat and oily sunscreen. I haven’t gotten in a pool or gone to the beach with one yet, though.I love these things because I always lose track of time and forget to reapply, but seeing a purple dot on my arm is an excellent reminder.

While writing this review, I looked at the Amazon page for SpotMyUV and I took pictures of what I received. The crux of my disappointment may very well lie at easily fixable problem on the manufacturing end: IMPROVE THE INSTRUCTIONS.So, let's get on with the story.The sunspots are advertised as turning from the out-of-the-box purple (no exposure) to clear (sunscreen working) to purple (sunscreen not working).I put a sunspot on near the tip of my nose (which always gets the most sun), put sunscreen on, and waited. After 30 minutes, the spot was still purple, and I thought, "Wow, bad sunscreen lotion."So I tried another spot with a different sunscreen. Same results: after 30 minutes, the spot remained purple. What the heck. I left it on my nose and went outside.It was a clear day, not overcast at all. Most of the time was gardening full-on in the direction of the sun. At 7,000 feet, where the UV rays are almost 40% stronger than at sea level.After 2 hours, the purple finally started to fade. When I came inside after a straight 4 hours outside, the spot was clearish with purple around the edges. Ergo, ok, sunscreen must have been working at some point.The delayed feedback about whether my sunscreen was working was disturbing. The delayed feedback could lead you to believe your sunscreen is faulty when that's not at all true. So you could waste a few sunspots trying one sunscreen after the other just to get feedback (or no feedback).Now, if you haven't already, have a look at the picture I've added. You might have to Zoom in close to see everything. The Amazon page advises exposing the spot to UV *before* applying sunscreen. The package instructions? Nary a whisper about this. (Also, the package instructions are incredibly tiny and hard to read). So maybe the delayed feedback was due to not attentively explosing the spots to UV before I applied sunscreen (but why would I? There were no instructions on the package!)And now the expensive part. At this writing, the spots are $35.99 (read: $36) for a pack of 48 ($0.75/ea). You could buy 2-3 new bottles of sunscreen for that price. Assuming you or someone in your group can do basic math, you can then easily determine when it's time for more sunscreen by looking at your watch or asking someone the time.Overall, I would classify SpotMyUV and anything similar to it as a novelty. One and done.