Zinc Chromate Green?

Sweet, I'll take this, add yours and Ronald's notes to my notes and check out your thread on it to get an idea about it.

Thanks!

Understood and thanks Ronald. Have the nitrile gloves,respirator and a fan to blow in fresh air standing by and ready.

Thanks!

You might be seeing zinc chromate yellow. There's a yellow version that's softer, i.e. not made for things that won't be top-coated. The green was supposedly a more durable formula for hidden areas that won't get painted over. Apparently nowadays that's not always true according to my A&P but his stuff is "real" so his yellow chromate is definitely a less durable coating.

MIL TT-P-1757 REV. B specification covers the requirements for two types, classes, and colors of a one-component, alkyd-base, corrosion-inhibiting primer coating.

Type: The primers coatings consist of the following types:
Type I – Volatile content consists of non-photochemically reactive solvents
Type II – Volatile organic compound (VOC) content less than or equal to 340 grams/liter (gm/l) (2.8 lb./gal)

Class: The primer coatings consist of the following classes:
Class C – Chromate based corrosion-inhibitors
Class N – Non-chromate based corrosion-inhibitors.

Color: The primer coating colors consist of the following:
Color Y – Deep yellow
Color T – Green (FED-STD-595, color number 34151)

So if you see "Class C" on the can, it's the real-deal Chromate so it really works and is really toxic. In my experience, Aircraft Spruce is either out of stock on chromate or gouging for it. Much better pricing here or here .

I cleaned & repainted the interior of my tailcone from the stinger all the way up to both sides of the carry-through spar, and also the interior of the center section. Because I needed to crawl inside the tailcone and basically bathe in paint fog, I used Zinc Phosphate back there. But I wanted real chromate on the center section spar so I did that. Used a good 3M filter mask for everything.  

I did a lot of sanding and alumiprep, but I had a lot of surface corrosion that I wanted to get rid of and never see again. I'm lucky the steel wing attachments had very little corrosion and none in the surrounding aluminum, but I wanted the BEST protection so that got cleaned up and slathered in the real-deal chromate.

I posted some "before and during" photos on this thread , but I forgot to get photos of the completed job before I put the landing gear legs back on the spar.

Aircraft Spruce carries Zinc Phosphate and Zinc Chromate in spray cans in yellow and green. Chromate is considered carcinogenic, so applying it safely requires considerable personal protection equipment. Phosphate is not as effective but it won't kill you.

Good morning, I am looking to redo/fix the area under and behind the seats and behind the side panels to the yellowish green color, is this Zinc Chromate Green and is there a premixed version? Or is there a Zinc Phosphate that is about the same color? Currently Tweety is a mix of different paints from over the years. Anyone have experience repainting these areas?