Many years ago Ludwig marketed a rough coat spray to re-coat drum heads which they eventually discontinued, but I am not aware of the availability of such a product now.I was just in my basement looking for some paint and ran across a spray can of Rust-OLeum's Frosted glass arousol spray coating used to provide a semi-transparent coating for privacy such as in bathrooms. If sprayed on in multiple coats it builds up and may provide a rough surface for brushes. I sprayed it on a glass panel on my basement door window to test the idea. Moments after spraying it did have a rough feel to it. I will wait a while and re-spray and check again. I'll find an old drum head later and test on the mylar surface.
Dudley!
That is the kind of thinking "outside the box" that I really appreciate! What a great idea, sir! Please let us know how your experiment turns out. Thank you for sharing!!!
Brian