Zinc Chromate Yellow

gulfstreamV wrote:

Don't have the FS# at hand but the Testors bottle # is 1184

tho9900 wrote:

For all of those who were asking for the conversion chart, it is here: Vallejo Paint chart   There's two tabs at the bottom of the page, the one to the right gives a simpler view of normal names, and their vallejo equivalent.  (The regular names are to the left, look it up and scroll over all the way to the right for the Vallejo equiv) Darson from here on FSM was kind enough to come up with this, so any thanks (or complaints ) should go to him.

Bgrigg wrote:

gulfstreamV wrote: Don't have the FS# at hand but the Testors bottle # is 1184 Isn't that the green zinc though? Edit Testors Model Master Acryl #4851 is called Yellow Zinc Chromate.

Bgrigg wrote:

I don't use enamels so I'll defer! I just remembered then I built my P51 it called for yellow zinc chromate in the wheel wells and Tamiya suggests XF-4 Yellow Green that looks about right to the pics on the IPMS Stockholm article, so that's what I used for that. Considering you can only see it if you pick it up and turn it over, that'll do!

Through some of my research I found out the following.

Aircraft manufacturers were getting their Zinc Chromate Yellow from car makers.  As the demand grew, the car makers could not keep up with the demand.  Boeing took Chrome Yellow, mixed zinc powder and aluminum powder and called it Zinc Chrome Yellow.  Curtiss took Trainer Yellow and mixed zinc powder and aluminum powder and called it Primer Yellow, later called Curtiss Yellow Primer.  None of these matched the ZCY provided by the car makers.  The USAAC asked Boeing for the formula and specified that was the color to be used.  It became known as Zinc Chromate Yellow.  The problem was that each manufacturer did not follow the exact mixing procedure, even Boeing, so that is why so many shades appear.  Some aircraft manufacturers continued to get their ZCY from the automobile industry and even their shades differed from batch to batch.

I do know that ZCY was used in the 50's 60's and 70's on doors, panels and inside of electronic compartments.  Zinc Chromate Green was used in wheel wells, missile bays, and bomb bays up until the late 60's. 

Bgrigg wrote:

Yeah, that's the only one I could find too. The FS number you mentioned looks more like chrome yellow, not chromate yellow. This is why I've only used Interior Green! LOL!! edit how about FS 13670?

That color looks a little too green.

Bgrigg wrote:

Yeah, it does, but not as green as the one offered by Vallejo (33440). Tell me Bill, what is the project and what paints do you use?

The project is for the Intercepter Group Build.  I am doing F-102A, 56-1027 from the 32nd FIS, 1963.  The aircraft had the left forward electronics door damaged and the replacement door was all ZCY.  It flew that way for over six months until one day I came in to work on a Monday and found the Buzz Numbers on all of our aircraft were painted over.  My jet, 027, also had the Fwd Elect Pnl finally painted.

As far as paints I use mostly Model Master and Gunze with an occasional Pactra thrown in.  I try to stick with acrylic but have to use enamel when acrylic isn't available. 

For enamel I highly recommend Xtracolor X408 Matt Zinc Chromate.

I checked with several on line suppliers and none carried the MM ZCY.  Squadron did have Aeromaster interior yellow which is a match to the paint chart I have so I ordered through them. 

That is the only color holding up my starting the "Slobering Wolf" Deuce.

I *believe* (not 100%) that the FS number would be 33481 for yellow zinc chromate.  checked it out for the paint ref I have and verified it on another site... but sounds like you found what ya want...

good luck!!!

tho9900 wrote:

I *believe* (not 100%) that the FS number would be 33481 for yellow zinc chromate.  checked it out for the paint ref I have and verified it on another site... but sounds like you found what ya want... good luck!!!

That sure looks like it.  Now I will be able to make my own now that I know the FS number.  I am going to file that one away in case I need it.  Thanks for the information.