Rubber glue. Dissolve small pieces of rubber in gasoline, benzene or toluene. Dissolving takes several days, even with frequent stirring. The finished glue should have the consistency of thin oil; if it is too thick, add the solvent used. Rub the rubber surfaces cleaned with coarse-grained sandpaper with a thin layer of glue; wait until the glue appears to be completely dry, place the glued surfaces firmly (not try to correct!), squeeze and leave for 2…3 h.