As a texture and faux finish contractor, I use joint compound to do many interesting finishes. T...As a texture and faux finish contractor, I use joint compound to do many interesting finishes. This particular tool is called a crows feet or slapbrush (because basically you are "slapping" the device on the surface to do an impression of the fibers.)
The most professional results will be if you use the method of rolling loose joint compound on the surface first. You want to make sure you have a product that has a long open time. No quick dry stuff for this process. It will be like rolling paint. Once you have your surface ready you need to "butter" the surface of the tool. By butter I mean that you add mud to it before you start.
If you are doing a ceiling, attach the tool to a broom handle or paint stick. You spin the tool as you go so you have more random application. Also, you slap the surface HARD. If you don't the fibers will load up with joint compound and start pulling away mud from the surface instead of making an impression. And will get very heavy!
I wouldn't recommend using this tool to fix a stippled ceiling. Instead, use a smaller version (more round) and roll on compound with a fluffy 4" roller.
Another thing to consider is the cleaning and drying of this tool once you are finished with your project. I would do it all in one day and then toss the tool. Joint compound is difficult to remove from the fibers. If you really want to do this, use a big bucket and running a stiff nylon paint brush or scrubber through the fibers. Do a final rinse with a hose and let air dry flat. For the price of the tool, that's a lot of work!
Faux finishers also use this tool for making patterns with glaze.
by painters1953