it stands up to CLP for sure, but I haven't tried Hoppes 9 or any bore specific cleaner, not sure I ever would on a lower or barrel.
the color does not match since the stag is a little gray. it matches to ameetec and DPMS I have.
I have used the pen on the delta rings, all around the lower, on the mag release button, and alot on the front sight base where I took it off to put on a free float tube.
the black is glossy until dry, then once you rub it with your finger or cloth it dulls up alot. You can definitely tell I have gone over my stag builds extensively with the pen, but I love it, it is just to cover up the blemishes. Once you take your gun to the range and run a few K rounds through it, you won't care, no matter if it's a factory gun, cause you are always going to nick up your gun. Just like the scars and tattoos I have, my patchwork touched-up guns have character.