DuraCoat over Blueing

DuraCoat is supposed to be applied to clean, sandblasted metal. That said, there are a lot of DuraCoated guns out there that were just sprayed right over the bluing. If you want to do it right, either sand and grain the metal, or sandblast it. It works best to apply it directly to clean metal.
 
The couple times i've used duracoat I just went right over the bluing. I just used duracoats trustrip and roughed it up with a scotch pad, and that did lighten up the bluing some. Seemed like it turned out fine for me.
 
All of this basically comes out in variations of the same place. The surface needs to have a little "tooth" to provide good adhesion for any coating-type finish. The only difference between blasting and using something like a Scotch-Brite pad is the degree of texturing the surface.
 
When i DuraCoat blued finishes i rough it up with some 600 grit sand paper. The integrity of your finish REALLY depends on your surface prep.
 
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