Some of my older paints have a tendency to dry to a semi-gloss finish that i do not like very much. Very annoying to highlight a glossy basecoat with matt highlights....
Sometimes it is because the matte medium has settled on the bottom, and then it can be remedied by poking it loose anfd then shaking the bottle vigorously for a couple of minutes, but other times the matte medium seem to have vanished (or having been too thinned by repeted additions of water).
Does someone make a good matte medium to use for acrylic hobby paints?