How about that stuff you dip metal tools in to make a rubber handle? Plastidip
http://www.plastidip.com/industrial_solutions/Plasti_Dip
Multi-purpose air dry, synthetic rubber coating that can be easily applied by spraying, brushing or dipping. Plasti Dip resists moisture, acids, abrasion, corrosion, skidding/slipping, and provides a comfortable, controlled grip. Plasti Dip protective coating remains flexible, stretchy and will not become brittle or crack in extreme weather conditions; -30°F to 200°F. Plasti Dip can be applied to anything that paint is applied to and more.