Have a problem with my Protekor rear bag sliding each shot, so that I need to realign it before next shot.  The cement bench top I use is very smooth.  I glued preforated shelf lining to bottom of the flat leather bag surface, but no help. 
Other than sandpaper is there any product out there to create a rough surface for the bottom of my rear rest?
				
			Other than sandpaper is there any product out there to create a rough surface for the bottom of my rear rest?
	








