SPOTMYUV UV Detection Stickers for Sunscreen with Patented DERMATRUE SPF Sensing Technology | KNOW WHEN TO REAPPLY SUNSCREEN TO HELP PREVENT SUNBURN - 32 Count

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.

i was skeptical, but i used these on a very hot, sweaty summer day and reapplied when the sticker told me to. no sunburn! yay!

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 love this idea/concept and I *think* it can work BUT their directions are so unclear. I was expecting the dot to turn back to a dark purple when it was time to reapply. NOPE!! Just a light purple. I was waiting for a darker color to reapply and got pretty burnt. I’ll give these another try but they might not actually work as others have said. But they might. I guess either way, if it’s a reminder to reapply and it stays on your mind then it kind of works without working. I recommend high spf sunscreen - you have to wait the 30sec before rubbing it in- and just be diligent beyond the dot.

Very difficult to apply. Did not change color even when I applied a thick amount of sunscreen that was newly purchased and 70+ SPF. Do not waste your money.

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.

You have to put the sticker first, then the sunscreen, wait 30 seconds, rub it and then go out in the sun and wait about a minute so they can turn clear. I tried these stickers with 6 different kind of sunscreens and this is what happened:Photo 1: you can see the stickers with no sunscreen. They are bright purple.Photo 2: I used one Japanese mineral sunscreen on the right and a mixed Korean D’alba sunscreen on the left. Both turned clear and as expected the mineral was thick and left a white cast. A few hours later they both were still clear. Note: I wasn’t on the beach but driving and place them on my left arm where the sun goes through the window.Photo 3: how they looked after 6 hours running errands.Photo 4: I used two different Korean stick sunscreens. Neither of them went as clear as the regular sunscreens. I wait about 3 minutes and they turned kind of clear but not as fast as the others.Photo 5: I used powder sunscreen on top of the stick on the right and sunscreen cushion on the left. The left went clear right away and the right went a little clearer but not completely.I’m very pleased that I could see the effectiveness of the products I buy.

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.