not sure the "silicony stuff" is really removable, but note that when a tire shop patches a tire or tube, they buff it with a wire brush before applying the glue, seems sensible that roughing up the surface will help a lot
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics