Glow paint is regular paint with glow in the dark powder mixed in. Quality varies due to variances in powder quality, amount of powder in the paint and the paint quality.
You can make your own paint very easily but should know the basics about the powder first. I use a V10 powder in hi-vis or super bright green. Depending on particular project, the grain size differs. The larger grain will produce a brighter glow and last longer but in paint applications it is not the best choice. It is best with epoxies.
For painting, under 30 microns is best. It is small enough to blend in the paint without causing adhesion malfunction unless too much powder is used. The phrase " the more the merrier" does not apply here. Too much powder and the paint will not stick and this is why many glow paint get a bad reputation- they put in a lot of powder to get the best glow effect but soon it flakes off.
The paint that sticks the best has just enough powder but does not glow as bright or as long.
When I am using powder with paint, I rough the surface with sandpaper to allow the paint a better grip then apply first thin coat of paint only. When it reaches flash point { point when sticky to light touch but not cured } I'll apply second thin coat with slight powder blend. Then, again at flash point, apply a clear paint with powder blend. This process allows the pure paint to stick to object and subsequent coats to stick to each other. It reduces flaking and increases glow factors.
Another option is to coat object with clear resin then at flash point, cover object with powder. Maximum glow !! Once cured, apply a light spray of clear paint to reduce amount of lost powder.
Glow powder is expensive if you want top quality stuff. I get mine from a company in Charlotte NC and the cost is about $100 per pound plus shipping and duties. This place produces some great stuff- average glow time is advertised at 24 hours, but true time is quite a bit more, maybe 36 or more. And, rather than fast light up/fast burn down, it lights up quick enough and the first 20 seconds is the burn down time to a steady glow.