Birchwood Casey Fast-Drying Fast-Acting Presto Gun Blue Touch-Up Pen for Restoring Scratched and Worn Areas, 1 Count (Pack of 1)

Worked well on a vintage scope. Cleaned and degreased it with alcohol prior and it looks good. Note: rubbing a graphite pencil ( I like to use a carpenter's flat pencil) with some gun oil will clean up some of the scratches and gunk fairly well. Just make sure all the oil is completely removed before applying the cold blue pen and follow the directions.

Works great on small worn spots on steel barrels and receivers. Wipe it on and watch it darken, great stuff to help keep your firearms in rust free condition longer.

I installed new sights myself on my LC9 that didn't fill the dovetail joint all the way. Had about .010 of the base of the joint on each side of the front sight still exposed and the coating was very light under the original sight. Probably due to the original sight being installed then uninstalled which is normal. Also on the front sight, before installing the new sight, I had to clean up the front and rear "sharp" edges of the joint ever so slightly before installing the new sight. About .005 on both front and rear. Against that black of the slide, that silver stood out like a sore thumb! There was no damage, just the coating was worn. I looked on YouTube for a solution and saw this pen. So I tried it and it worked perfect!!! I cleaned only the area missing the coating with a cue tip lightly moistened with some acetone (wife's finger nail polish remover lol, same thing) very well. Let dry for a minute or so then used the pen. I went over the silver lines about 5 times letting it dry for a minute or so before each application. I also used a "NEW" soft bristle brush I bought from Harbor Freight (about a buck) every couple coats to kind of blend it a little. It was about 99% perfect. I don't think anyone else would of really noticed but me, but when I took a cleaning patch with a dab of gun oil and wiped it down even I couldn't see it anymore. I took another patch (no oil this time) and wiped the area as to get as much oil off as possible and it was absolutely perfect!!! Nothing came off and I couldn't even tell where I did the touch up. I really tried my best with a couple more clean patches to wipe it off and it still looked great. I see that some reviewers didn't have the same experience as I did and I was on the fence about buying this, but I'm glad I did. The job came out so great except for those darn lines that really bugged the heck out of me. Anyhow, problem solved!

Very useful pen. I scratched the barrel of my new handgun Browning Buckmark when I tried to remove it. I was very frustrated for my bad luck. So I read about the pen and its positive comments. And I decided to try. After reading the instructions I simply used the pen. Fantastic no scratch appears now. I highly recommend this gunsmith tool.

Wow, just wow! A product that works as advertised. My expectations were exceeded. I did a redneck gunsmith job with a dremmel and this stuff made it all look professional. I highly recommend.