I was wondering if this stuff works as good as the ad says, I'm sure it won't work as well as traditional blueing. I've got a Turk Mauser that needs dressed up and really isn't worth the cost of having a smith do it. The Mauser in question has most of the blueing intact, only the part of the barrel not covered by wood is bare. I see it comes in 4 & 8 oz bottles, how much does one need?