I have used this to mix several dozen pots of Tamiya, Gamesworkshop and Reaper mini paints, in different kinds of bottles and droppers. They've all mixed really well, and actually produce a 'vortex' inside of the bottles.This doesn't just vibrate like some others, this does spin around rapidly, mixing properly.I've only had it two days, but I've mixed up 60-70 paints with it already. 10 seconds top up, 10 seconds bottom up, and the thing is mixed.