Nail polish.
Prior to designing the nylon tip he would use his wife’s nail polish to try and give them a longer lifespan.
Joe was a great guy. I had the pleasure of working for Regal Tip from 2004-2007. Although he was retired he would frequently visit the office and continued to come up with new ideas and concepts. One such post-retirement innovation was the E-Series tip. A nylon tip stick that sounded closer to wood while still providing the durability of nylon.
Much of the machinery in the factory he designed and truly innovated much of the things we drummers take for granted now. Like matching sticks according to weight and wood grain.
At some point every major Drummer played Regal Tip. Alex Van Halen, Lars Ulrich, Dennis Chambers, Peter Criss, Carmine Appice, Stewart Copeland, Dave Grohl, Josh Freese, Jeff Porcaro the list goes on and on…
102 is a hell of a run. My condolences to the CALATO family, may he rest in peace.