Here's the wrap-up of this thread ...
I painted the blue bowties on my hub caps with the color defined by the GM Heritage Center. I used a decal from one of the suppliers for the bowtie on my hood emblem because I didn't want to remove it. You can't see the emblem and the hub caps at the same time to compare.
> I'm happy with the results (hub caps - poor picture)
Here is a recap of my Blue Bowtie Journey. Thanks to Brad Allen, Tim Lederman, and Denny Graham for helping me understand paint chemistry and the codes used by the manufacturers.
The 1954 Truck Specifications didn't give detailed info on the colors used on the emblems.
> Hood and Grille AppearanceI contacted GM Heritage Center to ask for the color to paint the bowties on my '54 chrome hub caps.
> GM Heritage Center Contact InfoThe Center told me that the color of the bowties on my hubcaps was 1954 Mariner Blue and sent a link to PaintRef.com that shows modern paint codes for the color. PaintRef.com shows that DuPont used one code for Mariner Blue for all model years of Chevrolet AD Trucks '47-'55. But it also shows that PPG has two codes for Mariner Blue during the same period. PPG #10419 is for model years 1947-1952. PPG #10984 is for model years 1953-1955. Brad, Tim, Denny, and I didn't arrive at a definitive reason for PPG having two codes and DuPont only having one code.
> Chevy Trucks with Mariner BlueHere are the PPG paint mix formulas for '47-'52 Mariner Blue (PPG #10419 on the top), and for '53-'55 Mariner Blue (PPG #10984 on the bottom). The local PPG store printed them for me to confirm that they are two different colors. Although the "Manufacturer" does not say CHEVY TRUCK, I was assured that each PPG mixture number produces only one color. I did not have them mix the older color PPG #10419.
> PPG Mariner Blue formulasNOTE: I don't know if Mariner Blue is the correct bowtie color for other model years. Contact The GM Heritage for more info.
I purchased a pint of PPG #10984 1953-1955 Mariner Blue from the local PPG store and painted my hub caps with an airbrush.
> Can of '54 Mariner Blue purchased from PPG> PPG Product Info3M Vinyl Tape 471+, 1/4 inch, 06405 does a good job of masking the compound curves around the bowties.
> 3M 471+Here is a pic of 1953-55 Mariner Blue vs 1Shot Reflex Blue. '53-'55 Mariner Blue on the left. 1Shot Reflex Blue on the right. The colors probably do not show true on the screen. The pic is for relative comparison.
> Photo comparisonBased on the photo of '53-'55 Mariner Blue and 1Shot Reflex Blue, I estimate that PMS #282 is the closest PMS color to '53-'55 Mariner Blue in my Pantone color set.
R: 0
G: 38
B: 84
hex 002654
FYI - I estimate that Reflex 1Shot Reflex blue PMS color lies between Pantone Reflex Blue and PMS #280. 1Shot Reflex Blue is slightly lighter than PMS #280.
> PMS color chartIf you want to use model airplane paint to approximate '53-'55 Mariner Blue
Enter hex #002654, or enter Red=0, Green=38, Blue=84 in the boxes on this web page, then click "Show matching paint"
> Model Airplane Paint- Lonnie