I was wondering what type of pen everyone is using to sign their calls with? I am looking to sign the glass soundboard on them. 
Thanks, 
			
			
			
				I use the Uni-ball Vision.  Its waterproof ink was a must since I use a water based finish.  Never tried it on plain glass tho.  I have used it on painted sound boards.
			
			
			
				Pilot G2 gel pen
			
			
			
				Crows quill and an ink well 
			
			
			
			
			
				I use an Archival ink pen it will last forever, and you can buy different size tips.