This hot-glue gun uses 7mm glue-sticks and has a small orifice in the nozzle that makes it easy to pour out tiny quantities at just the right places. I used it to stick fans inside Raspberry Pi cases, create bumps on the back of my phone case (to raise the camera lens above the table), and even bumps on my old Laptop bottom where the original rubber pads had fallen off. Folks with interest in arts and crafts will also find it very useful.
The gun takes time to heat up. The manual advises waiting for 5 - 7 minutes before application. If you have never used a hot-glue gun before, you can do research on video-sharing sites regarding the best way to use them, and also to avoid the mess left behind by hot-glue.
For product improvement, I felt that the included metal wire-stand did not raise the gun tip enough from the table surface. Addition of a single LED bulb at the tip would also make it easy to see what you are doing.