This Brazilian site describes a process for combining a disposable syringe and a cheap hot glue gun, sans heating electrics, to make a pistol-applicator for solder flux paste. But I see no reason why the same process could not be used for other flavors of room-temperature goo. [via Hack a Day]
More:
- HOW TO - Make a precision hot glue gun
- Weekend Project: Hot Glue Web Gun (PDF)
- 3D Printer made from a Glue Gun and Meccanno