Birchwood Casey Perma Liquid Gun Blue 90 ml

Birchwood Casey Perma Blue Liquid Gun Blue is a 90 ml fast-acting liquid for touching up or completely re-blueing most steel firearms. It provides a non-streaky, blue-black finish and requires the metal to be thoroughly cleaned and free of rust before application. It is important to note that this product will not work on stainless steel, aluminum, or other non-ferrous metals.
How to use
Ensure the gun is completely clean and rust-free.
Apply the liquid with a swab to the clean, degreased surface.
Let the liquid sit for 30-60 seconds.
Rinse the area with cold water to stop the chemical reaction.
Wipe the area dry.
Repeat the process for best results.
Important considerations
Not for all metals: It will not blue stainless steel, aluminum, or other non-ferrous metals.
Comparison to paste: Perma Blue Paste is slower to darken than the liquid but can build up a denser finish.
Preparation is key: Thoroughly cleaning the surface of rust is crucial for the product to work correctly.