Here's the sign I mentioned working on previously.
It's painted primarily with Golden brand Fluid
Acrylics, which were a nice consistency for
the flowing lines and small brushwork.
This brush, which I bought on clearance several years
ago, came in very handy. The store display had it labeled
as a sign painting brush, and it turns out to be just that!
The brush is cut at an angle, so it holds an adequate amount
of paint while coming to a precise and swirlable point.