In my view, there are about 4 different types of acrylic paint:
-> Heavy Body (and OPEN Heavy Body): If you love to see texture in your artwork, this viscosity is for you. Combine it with a stiff bristle brush, and you have texture galore! So what is OPEN? Golden Paints give you this option as a means to slow the fast drying quality of acrylic paint. OPEN is perfect if you have made the switch from oil to acrylic.
-> Soft Body: Now Liquitex may tell you that their paint is Heavy Body, but no. It is Soft Body. And if you apply one out-of-the-tube line of Golden and another of Liquitex, you can see the difference. This viscosity is just slightly less heavy. Yeah. So why use it? If you struggle with the “heaviness” of Heavy Body, then this is a good choice. You get a similar texture quality with a stiff bristle brush but with less “goopiness”. (Hey, I believe in keeping it REAL. “Goopiness” IS a scientific word.)
-> Fluid: It is just as it sounds. F-L-U-I-D… Most acrylic artists who prefer smooth over texture choose Fluid Acrylic. However, here you might want to lean toward the softer bristle brush to keep a consistent brush line.
-> Ink: Yes, there is acrylic ink, which actually is “The Thing” now. Acrylic ink has a watery viscosity which allows it to move freely across the page without water or a brush. Mixed media artists love the freedom and unpredictability of ink. Of course, as an acrylic, you can still apply it with a brush but it will give a similar consistency to watercolor.
So which do you choose? Of course, it depends on your preference and how you want to paint to lay on the substrate. If you are starting out, get a viscosity of the same (or similar) color and try it. But always keep in mind: you do not have to choose one viscosity. All acrylic products play well together. So long as it’s acrylic, go for it!