The Mr Hobby acrylics used to be my favorite paint, they thinned with water and range of colors and quality was great. Was bummed they got pulled due to some ingredient being bad for you, but just came back to my LHS.
I saw the same great colors and happily bought about half a dozen bottles....then I tried to use them. They are "acrylic" but I've never seen anything like them. Do NOT thin with water, these paints turn into globby "gunk" when water hits them. In fact make sure your AB or brush is dry, otherwise your going to have goo on your hands. There is a new thinner for them and it smells pretty powerful, just like the paints. I'm going back to MM and Tamiya acryl. MM is totally thinned by water and Tamiya will at least wash off with it, but still needs a little alchohol to really get it working right. If I wanted paints that smell powerful, need a special harsher thinner I'd have bought enamels. Oh and these hate water too, at least enamels just shrug it off and don't do much.
Pretty bummed, as these were my favorite. Never heard of an acrylic (and they are labelled as such) that gums up when exposed to water. Hope these work better for someone else.