Got this for my miniature paints. Saw some videos of people mixing by pressing the bottom of the bottles into the silicone cover. Nope. Really only works if you poke the cap into the hole. Bummer, because then my bottles are upside-down, but it really works when it works. Skips around the table a bit too, if you're lucky. Pretty solid for what it is, when you figure out where to poke it, but a tad overpriced.