Acrylics can dry frustratingly fast when you are trying to blend, and this retarder solves that. Added to your paint, it slows the drying time, keeping the colour workable for longer so you can push wet-on-wet blends and smooth transitions that would otherwise set before you finish.

A few drops go a long way, so add it sparingly and build up as needed. A quiet hero for anyone doing brush blending on figures and detail work.