Rob, I’ve been down this road before. I even sourced my own glow-in-the-dark tape and a multi-size hole punch. They do work, but you definitely feel them on the side of the neck. I find they only last so long, fall off, and need to be replaced. They do work, to some extent.
I’ve also tried glow-in-the-dark paint and nail polish, and neither worked well. The stuff I posted is supposed to work better and I imagine, with a clear nail polish cover, it won’t wear off and will be smooth to the touch.
Another option is Luminlay dots. I’ve installed them on a few necks. It entails drilling out the old markers and gluing in the Luminlay rod, cutting it off, then finishing to lay flush. The drilling can actually be done by hand with a little hand rig, though I use a mini desk-top drill press. They work quite well and will provide usable light for about 20 minutes in the dark. You can recharge them in about 10 seconds total with a small ultraviolet light.
If you want to try the tape-on dots, PM me you address with how many dots you want, and what size, and I’ll punch some out for you.
Bill, tgo