Most envelopes are pre-glued with 'gum arabic'
Probably casein glue.
White glue.
White glue
Yes, just be careful what type of glue you are using because it might make the decoupage paper bubble or tear from the wetness.
Yu have to use school glue
Quilting maybe scrapbooking if you want to design to fit a certain way
Gluefast paper glue.
Glue dots are very similar to tape. They are used in scrapbooking to attach pictures and embellishments to the paper. They are about a quarter inch in diameter.
Silicone will do that.
For scrapbooking, I use the Windows Movie Maker application.
If gluing paper to paper, white glue is best.
you use a non toxic nail glue
Elmer's new China and Glass Glue.
Any kind of epoxy is best for this