Actually, I suggest not using a paintbrush at all. Years ago, I thought the paintbrush was a great way to apply dressing... and it was definitely an improvement on previous methods that I was familiar with. However, for the last few years I have been using foam. Specifically, I purchase a sheet of 2 inch thick soft upholstery foam from the fabric store and then cut pieces off to size. Approx 2'x3', or whatever size feels comfortable to you. The foam soaks, holds and then distributes your dressing great. Another reason I prefer this foam method is precision. The edges make it very easy to control where the dressing is applied and makes a great edge that fits in between the tire and the wheel rim. When that piece is worn out, you simply cut off a new piece of foam using scissors and you are good to go.
