Acrylics, because they are water-based, can be thinned with water to create transparent washes. But the pigments don’t tend to adhere very well once this is done, which is where glazing media come in. These additives are fluid, but they are also slightly adhesive so they stick to painting supports like panel and canvas, as well to any underlying layers of paint or primer. Each layer must be perfectly dry before applying the next layer, but these glazes are quick dying and won’t slow you down. They can be mixed with acrylics to achieve luminous transparent color or applied on their own—though opaque when wet, they dry clear and are available in a variety of finishes. Glazing medium is not recommended for use as a final top coat; use a removable acrylic varnish instead. Choose the glazing medium for your project from our picks below.