Making sensitive player piano pouched
It's a kinda fun topic and I enjoyed reading about the different methods of sealing leather. Pouch leathers today are far different than original pneumatic leathers of yesteryear. Much of Playerdom's famous pouch leathers came from registered herds of Scottish highland sheep, bred especially for their skin as pneumatic leather. So resealing old rubberized leather pouches stiffens them further. Since egg white tends to stiffen leather, it should be painted on the leather first, before the leather is ever punched out. In my book, it is unusable for sensitive reproducers, although it will work for cut-off pouches on stack cut-offs, and stuff like that, as long as you talcum powder it heavily because that leather will remain sticky for a long time, otherwise. Columbia Leathers also carries a Burgundy-colored leather with good longevity but it is an organ leather, designed for uses other than small pouches operating quickly at low reproducer pressures.