For glazing with acrylic paint the best results are achieved with Glossy medium or Amsterdam Glazing medium. When thinned with water, there will be less binder and the colour becomes more matt. When thinned with a glossy medium, we add binder, the colour becomes shinier and thus the colour impression stronger. If extreme thinning is desired, it is always advisable to use glazing medium instead of water, because adding a lot of water can loosen the pigment in the paint from the binder; the pigment then lies unprotected on the painting and can run off.