The glue is blue when it is wet but turns clear when it is dry! This makes it an essential item for scrapbooking as you can see exactly where you have put your glue but of course it then doesn't make a mess as it dries to clear.

The dual action:

Wet Bond - (Permanent) Use immediately after applying adhesive (make bond while glue is blue)

Dry Bond - (Temporary) Apply lightly and use after adhesive is dry (make bond after glue is clear)