I use Montana Pitch Blend on my cordovan tabs. Keeps them supple and slick. Back in the old days when field archery was hot most guys and gals that shot with a tab had a little powder dispensing contraption strapped to their belts or quivers. I used a glove and one of my mentors, who then was the NY State Field Archery Champ taught me to melt paraffin wax into the stalls of my glove and it seemed to make it a bit smoother to shoot and added some longevity to them. I also found that serving my string with monofiliament fishing line made for a cleaner release.