Sakura Poster Color EX is a poster color in tubes. It is slightly water-resistant, so one color can be painted over another easily and the finish comes out clean. Water splashed on a finished piece does not leave marks.
The sets use 12 ml laminated tubes. There is an 8-color set and a 12-color set with 13 tubes. Single tubes are also sold, so you can replace only the colors that run low. The single colors include the three primary colors for mixing.
Because it layers easily, it works well where you want to add another color on top of a painted area.