Birchwood Casey Aluminum Black pointers?

I'm going to help a friend work on used .22 Henry she was given by her sister. It looks to me like the gun was exposed to salt water because it has some pretty significant corrosion on the receiver and some of the other aluminum parts. The blued barrel is in surprisingly good shape and I think

Birchwood Casey Super Blackâ„¢ Touch-Up Pen (gloss black) 0.33 ounce – BushWear

Tried and used Birchwood Casey -- Aluminum Black

Birchwood Casey ALUMINUM BLACK TOUCH-UP 3 OUNCE Touch-Up Metal BC-15125

Aluminum™Black Metal Finish, 3 fl. oz. Bottle - Birchwood Casey

BIRCHWOOD CASEY - Hunting, Shooting, Airguns, Scopes, Camo Clothing Store

Super Bright Touch-Up Sight Pens

Birchwood Casey, Westlake Market Aluminum Black Touch up Bottle (15125) with 25 Cotton Swabs for Restoring Guns (Aluma Black PAB17) : Sports & Outdoors

Birchwood Casey Aluminium Black Metal Finish for Airgun and Model Making

Birchwood Casey Brass Black