Natural rubber is sticky, as in rubber cement; with this process patented in 1844, it can be used for hockey pucks
... Natural rubber-based sticky adhesives were first used on a backing by Henry 
Day... [DOC] [TLE] How rubber cement is made - material, making, history, used, parts ... [PAR] Rubber cement is a solution of unvulcanized (gum) rubber in a solvent, and ... 
two pieces of rubber together, which involves a chemical cohesion process.