Stop in for a cup of coffee
Amazon.
MG Chemicals 408C Rubber Renue, Rejuvenate and Restore Rubber Belts, Platens and Rollers 125mL​
Visit the MG Chemicals Store
H'm. They have polyurethane conformal coatings...
I've been looking at a 2 part polyureythane from Mcmaster ($155) or Permatex 82099 spray (mail order from 'zon or zorro, not stocked locally)