Removable glue is the same type of glue that you find on removable sticky notes. It can be purchased in tubes at any stationery store.
The tack is not as high as with glue dots. Most applications involve applying a light flyer or sheet of paper to a magazine or catalogue or applying a business card to a personalized letter.
You can use removable glue in many different ways. Please see the packaging concept Create Custom Sticky Notes.