Have seen a few folks using this in the forum and posting up good results. I myself like birchwood casey super blue better…I didn’t get the absolute perfect job in getting even result the length of the barrel, but multiple coats definitely helped. Felt like any of the areas that still weren’t perfect made it look like some patina from age….if you’re super anal and want it perfect, I think it’s tough to achieve with cold bluing. I read a tip to warm the parts up above room temperature with a heat gun, that it helps the reaction. Can’t say for sure that I noticed a big difference doing that, but your mileage might vary.