Have a look at this video from Kyle.  In fact, even if you are browsing this thread, and didn't think you needed Kyle's Impasto brushes, check this out because it has some cool information.

When done, if you liked the above video, have a look through the other videos in the sidebar.  There is some great information in them.

This does not seem to be an option from within Kyle's website and is not covered in the FAQs.