Birchwood Casey Aluminum Black Metal Finish, 3oz The choice of many armorers and gunsmiths to blacken aluminum parts. Fast-acting liquid is easy to apply with no dimensional change. Color will vary from deep gray to black depending on alloy. Aluminum Black Metal Finish is also excellent for blackening name plates, plaques, trophies and other engraved items. Restores scratched and marred areas quickly Fast-acting liquid is easy to apply with no dimensional change Final appearance can be enhanced by applying a clear coat finish, wax or oil Good for use on: AR-15/AR-10 receivers AR-15/AR-10 handguards Aluminum scope mounts and scope rings Aluminum pistol frames Other aluminum components