Set the eraser as above and brush lightly across the canvas until you have a similar look to the one below.
Apply a Filter > Blur > Gaussian Blur. Set the radius so you get the required detail of airbrushing Apply Edit > Transform > Distort to create the required shape depending on the blur applied it should come out something like below.
Here is an example of it in use.
Author: Tremorwave Important note: The author is not a natural English speaker and there is a high chance of mistakes in every way. Corrections and comments are welcome.