What is the best way to glue a wrapper that has come loose?
The best glue to use is Pectin. This is used by many cigar rollers. It is a gelling agent used in jams and jellies. You can find it in the food section of your local grocery. Add a little water to the powder and mix until it is the consistency of jam. Put some on your fingers (don’t use too much) and apply it to the edges of the loose wrapper. Then smooth against the cigar. You can smoke your cigar immediately, no need to wait for it to dry.