Have just bought a new Continental tyres " Argotal" and on the first ride out suffered a big cut in the rear tyre "Centre of the tyre" no problem to get home as used a plug repair kit. However, now trying to seal the hole with a patch on the inner tyre, no success at the moment as still have very small leak. Any suggestions for the best type of glue to use on the tyre ? I guess needs to be flexible also strong.