Thanks Maury, I'm glad you're around because you sure know the rules. (I tend to forget my own name)
I know what you mean when it comes to using it. It can be a real sticky mess. I've put some on my shooting pad for a spot to anchor an elbow.... the spot gets covered with bits of grass and everything else. Plus on a hot day prying myself away from the mat can be interesting. Using it on the sling would probably be more trouble then help.