They do not all glow at the same brightness, White, Blue and Green have the brightest glow of the whole package. It comes out smoothly and applies easily, no clumps or sputtering when I used it. The colors dry the same color as they are in the bottles, EXCEPT white. White dries clear without more layers.
I have not used it on actual fabric yet, I used it to personalize my phone cover and make it easier to find in the dark. Sometimes when I wake up in the middle of the night I can still see it glowing pretty well hours after the lights have been out.
I find it charges best and brightest after 8+ more minutes in sunlight (The longer the better). I find that some light-bulbs, especially florescence and energy saving bulbs do NOT charge it fast or well, though I have not tested this theory at length, it's just something I noticed that seems to hold true in my house at least.
It takes 4 hours to dry! Just in case you don't feel like reading the directions, of course if you are a "Crafty" sort of person you might be expecting this from the get-go, but I did not realize that at first. So if you are planning to use these in a craft with or around children be sure to have an out-of-reach out-of-the-way place for it to dry flat.
It dries a little bit gummy and can be picked off if you really want to try. (On plastic and rubber! Do not know about cloth yet.) I count this as a good thing because it keeps my phone from sliding off surfaces and it's possible to re-do if you make a mistake.
The bottles are not huge. 1.25 fl oz each, so when I use it, I take a less is more strategy. I noticed on the package there is a picture of a black shirt with some nice big designs of a heart, star, etc. But I'm pretty sure that if you did anything that big you would use up a whole bottle per design. I could be wrong as I haven't used it on fabric yet.
Overall, I would say it's a good product that exceeded my expectations, and I would buy it again if I found a need for it. Will update later if I use on fabric and notice anything worth mentioning.