The closer I got to the same look was to create a brush with the size of 1 pixel and 500% spacing, but it's still a bit slow to get even a small area looking like it's been sprayed. Plus, in the end my pattern looks too regular, not very natural. Here is part of the image whose look I'm trying to recreate (400% and 100%).
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
