I wish I could help with your question, but your link led me to something I've been looking for.
This part belongs in a modelling thread BUT I've finally found a source for US red anti-foul (aka copperite) paint.
https://www.hobbylinc.com/ak-us-navy...lic-paint-5020
The bad news (so far) is that you have to order a whole set of paint shades to get the red anti-foul.