How did the factory paint these pieces?

WissaMan

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How did the factory get the black paint on the sides of emblems, trim pieces, grills, etc. without getting it on the face or the back?

As an example, this New Yorker emblem below. How did they mask off the face so perfectly? And there's no overspray on the back side either. The only way I could see would be to have a mask that's the exact shape as the piece's surface adhered to it. But it seems like that'd be a tedious manual process back then.

And what is this plated with? Brass? I can't believe it'd be gold. But brass tarnishes, doesn't it?


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Have some denatured alcohol ready and just spray them black, then wipe off the face with the alcohol pretty much right away.


Alan
 
I could imagine that they had some sort of template that they pressed against the face and then a quick dusting of black paint. I sprayed mine all black and then took a rag soaked in lacquer thinner wrapped around a little piece of cardboard and wiped the shiny surface right away. Did this for all my emblems and trim that had the black accents.
 
From the mane plates on my cars, plus others I've seen from other manufacturers, IF the paint was sprayed, as they age and the paint deteriorates, you CAN see from which direction the spray gun was placed as the parts were sprayed. Especially on items which had sharp edges on them. This is especially common on GM/Chevy emblems! Paint did not get all the way to the bottom of the color divisions on all sides. Which is how you can tell from which direction the part was moving toward the spray gun.

In the case of the Chrysler nameplates, I have seen brush marks in the satin black areas! Upon much closer inspection of the entire item, I could then see more brush marks in them. Leading me to believe they were BRUSHED rather than sprayed. IF they had been sprayed, with the script, it would have taken a good bit of time to do all of the masking and then not get any on the backside of the item.

As to the "gold", there is a "light brass" color that looks somewhat "gold", but is not.

Additionally, there is a clear chemical one can put onto chrome to make it appear gold. In the past, when a Cadillac customer wanted a "gold package" on the new Cadillac, the dealer would send the car to a trim shop to get the new set of emblems installed (back when they were all mechanically installed). In later times, with stick-on plastic emblems, the fluid was just painted onto the chromed-plastic emblems while they were still stuck-onto the car. No taping-off required.

The other thing that might not be noticed is that if you lookk at a Chrysler production outside door handle, under fluorescent lighting, you can see the curved sand scratches under the chrome plating itself. Just like sand scratches under paint. Once I saw that, I then noticed that GM door handles are that way too. Have not looked at Fords. Those abrasive scratches are how you tell an OEM handle from a re-chromed handle! As the re-chrome is completely smooth and the "color of chrome" is just a bit brighter than the OEM color of chrome, by observation. Things you will not notice until you put the two items side by side or know what you are looking at.

Back to the original question . . . I suspect the newly-chromed pot metal nameplate was then dipped into a shallow layer of "gold-like" liquid, to get the finish-surface "golded". When that dried, then the satin black was applied with a medium-width brush, by hand. Not always neatly, either, as long as the sides were "satin black". A satin black that sometimes had some brush marks that were not always neat around the edges and could have some "light streaks" from brush marks in it. Any black that got to the back of the emblem was cleaned off quickly.

Just what I figured out over the years or looking at Chrysler and GM/Chevy emblems and name plates.

Enjoy!
CBODY67
 
I'm not sure how the black is painted, but the emblem itself is anodized aluminum. The aluminum is cast, polished and then anodized.

BTW, most all of that stuff isn't made by Chrysler and from what I've seen, there's more handwork done then you would expect, especially 50+ years ago. It could have had a die cut mask applied and sprayed. Possibly, a liquid mask could be applied to the face, the emblem sprayed, then cleaned. That could be done with some reasonable efficiency.
 
The place where I really noticed the hand painting was on the sides of the hood letters on our '66 Newport. Definitely not "sprayed, masked-perfect".
 
Great info! That's what I was really after, not how to do it myself, how they did it as a matter of curiosity! And I think you may be right about it being aluminum rather than pot metal. If it was pot metal I'm sure it would be blistering, but it's not it's perfect.

Regarding the color of the chrome it could be because they're using a different type of chrome. Hexavalent is the super toxic Erin Brockovich stuff and that what was used originally. It hasn't been totally banned but it requires much stricter handling than the "less unsafe" trivalent chrome. I found this description on a company's website.

"While chromium deposits from hexavalent electrolytes are silver with a blueish tinge, those formed from trivalent chromium baths can have an attractive and smoky appearance."

I've done some chrome plating using Caswell's system. I wouldn't call the results "smoky" but it does look slightly different than original OEM chrome.

Another thing that probably makes rechromed parts brighter is better surface prep, lots of buffing for that deep shine. Kind of like comparing a fresh OEM paint job to a show car paint job -- the former looks great when you look at it by itself, but when you have it side-by-side with a show car the difference is obvious.
 
These are actual paint masking templates from the original process. I can’t say that every different emblem had similar templates but I would find it hard to believe that there was much “hand brush” work even back then.
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Regarding the color of the chrome it could be because they're using a different type of chrome. Hexavalent is the super toxic Erin Brockovich stuff and that what was used originally. It hasn't been totally banned but it requires much stricter handling than the "less unsafe" trivalent chrome. I found this description on a company's website.
The New Yorker badge in your first post is anodized and not plated.

Simplified, electroplating basically coats the part with another metal, and anodizing brings the oxides in the metal to the surface of the metal. The "gold" in anodizing is a dye color and not real gold. Here's some reading on the differences.

A Guide to Gold Anodization Techniques and Finishing Options - China Die Casting | Aluminum Die Casting

More in depth.

Anodizing vs. Electroplating: What’s the Difference?
 
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