The Faux Sable paint brush, is hands down, my most used artist brush. Since I work primarily in acrylics, all levels of density, gels, and mediums, I'm able to easily move from one type of brush to another depending on the mood I'm in or the effect that I'm trying to achieve. But, since the faux sable can handle all types of watermedia and painting styles, I find myself grabbing them the most often.
Primarily for my abstract work, I do a lot of glazing in between layers and layers of pours. I need wide flat brushes, usually, and ones that hold a lot of fluid. I also need a brush that can lay down paint without leaving a stroke mark, almost gliding across the surface of the painting. The brush has to keep its shape because when I'm in the studio, it might sit in medium or water for a while before I head to the sink. I need a brush that can work with heavy paints and also light washes of water. Hence, the faux sable is by far my favorite abstract working brush. It is also my favorite for painting furniture, murals or faux finishes, especially working in small areas.
Faux Sable might be one of the easier synthetics to find in an art supply store, but don't be fooled. All faux sables are not alike. Each brush company relies on different synthetic hair suppliers, and companies may or may not combine synthetic hairs to mimic a true sable. As in shopping for any artist brush, take a close examination of the brush's ferrule, handle, feel and overall quality before you purchase.
For more brush information, check out the Dynasty Brush website.