Perma Blue

[Flying10uk]

I use the Birchwood Casey Perma Blue, Luis, although I wouldn't fancy doing an entire Bren Gun with it. I normally only use it for small parts such as bands and screws etc and for touching up. It is possible to get that vintage, dull, blue look with this product by first leaving the item that you wish to blue in a phosphoric acid dip metal treatment for a few hours and normally I would leave an item in the acid overnight before removing. After removing the item from the acid I then immediately wipe all excess acid off with clean rags or paper wipes until dry. The metal should have a light dull grey colour and after about half an hour the liquid blue can be applied directly onto this surface. I have also had good results with bead blasting parts before dipping in the acid. If you apply this blue to a shiny steell surface you will most likely end up with a shiny blue surface which will look wrong for the type of finish that you require.