Use dry for a temporary bond or wet for a permanent bond. They are acid free so ideal for fixing scrap-book items safely.
This acid free glue can be dispensed through a fine metal nib. When wet use as an ordinary permanent glue. Leave to dry after applying and it then becomes a removable adhesive. This glue goes on blue and dries clear so you can see where you are applying it.
To increase the flow replace the cap several times to pump the nib. Reduce the glue flow by holding the pen upwards and pressing onto a firm surface to release the pressure. Clean the nib and replace the cap after every use.