I've used it a bit with good results. I've been taking mine out of some old laser printer toner cartridges and keeping it in a quart yogurt container. No problems with leaks, but the toners is very light and tends to get everywhere. If you find the powder to be too messy, mix it with a small amount of epoxy resin and store it in that state. It would be easier to control and meter out when you need it. This is essentially what the commercial exoxy pigments are.