If the bronze finish is an anodized finish you can't readily repair it.
Anodizing is an involved process and not something you could do
yourself, so you'd have to refinish the entire door by painting. Same
case if it's a baked on, powder coated, or even painted finish. You
will probably never match the finish. Typical storefront bronze spray
paint cans if you want to refinish the whole thing. The door has to be
thoroughly cleaned prior to painting to remove wax and oil. It's also
a good idea to lightly sand all surfaces to be painted to improve the
Before going to all of that trouble, do some test with a colored
Sharpie permanent marker rubbed into some of the scratches. If it's
the usual situation, you'll notice the bright aluminum contrasting with
the darker bronze much more readily then a black or brown scratch.
The gloss/reflectivity is usually less where the finish has been
rubbed/scuffed. Polishing the door with a spray wax will give the door
a more uniform gloss and hide a lot of sins.
Give it a shot. You can always paint the door if you don't like the
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