For all of my loyal readers, this is just for you.
If you ever need to glue pieces of flashpaper together, use rigid collodion.

It's mostly used nowadays for making fake scars but it can also be used for things like sealing the ends of rope. It also burns up without leaving any residue unlike glue stick or other adhesives you might see recommended online at large green gaudy forums.
Try it, you'll be surprised.