The Presto Gun Blue liquid bottle is a fantastic deal. Its basically the chemical that is in the pen. I use it to refill my pen. Its just hands down an amazing product. I use it to get rid of any scratches on my firearms and airguns. It has some sort of effect on black metal. I also use it as a polish. Apply it with the pen, then rub it off with a towel, preferably with those yellow ones you can buy by the bulk pack.
Verified purchase: Yes | Condition: New
I used this gun blue to color wood screws for a vintage-looking hardwood box fan assembly. It works perfectly and the liquid can be recanted in the sturdy plastic bottle.
Verified purchase: Yes | Condition: New
I've never been a fan of cold bluing, but this solution works very well if the directions are followed. I can barley tell where I touched up the parts.
Verified purchase: Yes | Condition: New
works like a charm, fast an easy to apply
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
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