For many of us silk painters, who find that as we are aging, squeezing an applicator is getting harder and harder, a wonderful tool called the AirPen Pro is available. (I have one, but have not been able to use it yet.) There are 2 videos I have found online by two fabulous silk painters: Pamela Glose and Linda Marcille. I am including the videos here as they say it best.
Pamela Glose (top) Linda Marcille (bottom)