ZIG Memory System 2 Way Glue is a dual action permanent and semi-permanent glue in a pen. It is ideal for all your paper crafting projects and with their acid-free quality they are great for working with your precious photographs! For permanent use, use immediately after applying the adhesive to paper and photographs. This is when the glue is blue. For semi-permanent use, use when the adhesive becomes tacky. This is when the glue is clear and you will find that your paper and photographs can be repositioned. ZIG Memory System 2 Way Glue can also be used when applying glitter to paper, glass, foil and plastic surfaces. Also perfect for use on Vellum Paper. This ZIG 2 Way Glue has a 5mm (thin barrel) dispenser.