Stix2 Glue Pen - an acid free glue dispensed through a fine metal nib. Goes on blue so you know where you are applying it and dries clear.
When wet use as an ordinary permanent glue, leave to dry after applying and it is a removeable glue.
Increase glue flow by replacing cap several times. Reduce glue flow by holding glue tip upwards and pressing nib onto a firm surface.
After use, clean tip and replace cap.