Impasto gel medium can be mixed with acrylic paint to increase transparency but also to thicken the paint, retaining brush strokes. Impasto gel is also use to extend the life of paint, in that it enables you to stretch out the capacity of the paint covering a larger surface area. Impasto gel is available in several sizes but is also available in different finishes. The gel, when mixed with acrylic also determines the reflection of the paint, the more you add the more it will influence the finish and transparency.