The phrase "brush work" refers to the technique of using a brush to apply paint or create strokes in artwork. It is the way an artist handles and manipulates the brush to achieve desired effects and textures on the canvas. Full definition
Maybe, if you apply it with a lip brush it works better for you? (berriesinthesnow.com)
If you would like to use a brush I find a dense contour brush works in a pinch. (racked.com)
Too, what is happening at the base often finds its counterpart in the rapid flame - like brush work at the top of some of the squares. (minusspace.com)