The Super blue works well. I had a couple of scratches on a barrel. I removed all the old bluing to get a even bluing. I used alcohol & sand paper to clean the barrel down to bear metal. Followed the steps & repeated the bluing process 5 times until it matched the gun. buff to shine. wiped the barrel down w/ gun oil & it looked brand new. I used "Super blue" because it claims to be darker than Perma blue. It's been 3 mths & the bluing is holding up. Time will tell. It's NOT magic in a bottle ($10). So I doubt it will hold up as well as hot bluing or the OEM bluing. But for $10 & a little time, I'm very satisfied with the results.
The emblem is OEM. Perfect fit for my vehicle model.
(Know the year & model of your vehicle. Mercedes makes different size emblems for different model Mercedes.)