I have a spot on the barrel of my shotgun that I want touched up. Have have tried the birchwood cash touch up pen with unsatisfactory results.
What other product out there on the market is excellant for blue touchups.
Thanks
The one most people agree is about the the best is Brownell's Oxpho-Blue.
Remember that no cold blue will come anywhere close to matching a factory hot salts blue job in color match or durability.