Glazing is a technique commonly used in many mediums such as oil and acrylic to create transparent layers of color. Since acrylic can be used thickly with no cracking or adhesion problems, it also has the benefit of offering some more unusual painting applications. By using a thick acrylic gel, and adding this into regular acrylic colored paint, you can create a thick but transparent subtly colored mixture. Apply this mixture over previously applied dried and painted layers using a variety of application tools to create some unusual effects. There are many acrylic gels available for purchase. Gels are actually an acrylic medium, with the addition of thickeners, to create a thick or stiff acrylic that can be easily manipulated in a sculpting manner. I like using painting knives, rubber shaper tools, fingers, sticks, etc, as well as brushes to get my textural effects. The main point to keep in mind, is to use a clear acrylic gel to get the transparency, instead of an opaque paste. And to use a small amount of color into a larger amount of gel. I like to use a 1:10 ratio of color to gel.