That which is described as self vulcanizing tends to form a much more tenacious bond between
patch and tube, ie once cured the patch can't be pulled off the tube without some damage
being done. Rubber cement OTOH can easily be removed from patch/tube by comparison.
Vulcanizing type cement is recommended. The vulcanizing action only occurs 'rubber to
rubber' so using the cement on metal, wood, paper, it acts like ordinary rubber cement.
Non vulcanizing cement can be used for patching and will usually work adequately.