Anybody using one on their trains?
I had a small gap to fill in an area between a dome I made from pvc round stock and a diecast boiler shell. JB Weld just didn't want to cooperate. My daughter came by not long ago and gave me one of these pens, got it at a dollar store I think.
Anyway, I filled the gap with the "glue" and zapped it with the light on the other end of the pen for 5 seconds or so and not only did it fill the gap it's also pretty tough. It is sandable and a few swipes of sandpaper I was all done.
The glue is clear, I made sure the gap/area was as clean as I could get it and gave it a squirt.
Not sure if it'll work on scratches but it worked on a small gap.