Brownell's Acra-Glass. Trust me. There was an Ogden gunsmith I knew who could re-assemble a pile of sticks and splinters into a beautiful gunstock with it. And did.
Later on, Brownell's Cold Blue. But there's a secret to "cold" blue -- it only means cold in comparison to hot salt bluing. You want the metal to be pretty warm when you apply it. Not glowing red, but just too hot to hold onto. Clean the bewangus out of it to get rid of ALL oils, then warm it with a torch or heat gun before you apply the bluing liquid. Apply a couple of coats, re-warming if needed. It will look awful at this stage. Until you wipe it with oil and then WOW!
Just a heads up as someone that does traditional hot bluing, cold blue is only meant for small touch up areas and offers little to no corrosion protection.
