Grabbed some of the blue glow powder as an "add-on" to a filament purchase and I'm impressed. The glow is bright and lasts a while compared to other "glow in the dark" products bought elsewhere. It doesn't take much of the powder to grant glow properties to mixtures either. I will be buying more of this!

Yeah, so, this was definitely an impulse purchase when restocking some filament. When it arrived during daylight hours I was at first disappointed at the volume--this stuff is dense. A 0.5 lb bag was about 6" wide with 2" full at the bottom, between 1/4" - 1/2" thick. It's also a very fine powder. I do not think you would need much when mixed with acrylic or some other method of holding it where you want it. At night, with the lights off, I hit it with a strong light. Glows bright! I spent more time than I'd like to admit playing with it in the sealed bag it arrived in. This is also well under market price if you wanted to buy this elsewhere. No regrets... I think I'm going to buy some in green now.