I get plastidip at every Home Depot in our area, and most other hardware stores. Great stuff. If you "dip" as directed you get essentially a rubber handgrip or coating on your item. But also (and this is WAY NEAT!!!) if you thin with the thinners recommended you can paint this on things. It then dries to a very very sturdy layer of rubber.

Currently I make Kydex knife sheaths and handgun holsters. I don't like the "clacking" they make if they brush up agains things. So I paint a few coats of Plastidip over the kydex (plastic) leaving a quiet "rubber coated" sheath/holster. I've also used it to seal up an altoids PSK, to whip rope ends, and to coat a skeleton-grip knife.