I'm finding that the difference between the Elmer's rubber cement and the rubber cement you get in the tubes that come as bike tube repair kits is that the cement in the tubes is a lot thinner and more likely to go into the small poors of the rubber. The cement in the small tubes also contains ethyl alcohol and heptane to make it thinner. Does anybody thin their elmers glue? I have seen where the cement peels off the rubber. Is there a chemical which actually loosens or thins/desolves the rubber itself? Also is a thicker or thinner layer found to be better to make a better patch?