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A quick google search brings up a whole lot of bad experiences with these nitesite stick on sights. Pretty much all of the negative comments about them is they don't stay on due to them being a stick on and that they don't glow that long at all. Not to mention poor customer service. I'd pass.
So I finally received my Glow-On product yesterday. I followed the directions and applied it to the slide of my Sig Classic 22lr last night and am still waiting the recommended 24 hours curing time. But I decided to just charge it a couple of seconds with my tactical flash light and all I can say is WOW! The Glow-On product has turned my plain 3 dot sights into something brighter than the SigLite sights on my 9mm slide. They glow so bright that you still see the glow in a fully lite room. I will still have to see how long the charge lasts and how they hold up but I can tell you once it hardens it feels very durable and one tiny little bottle can apparently do 40+ gun sights and I can believe that. Totally worth the purchase IMHO. Here's a pic of my new sights with only a couple of seconds charge and in person they are a lot brighter.