Engine Paint Question

'68- very early '69 340s were Industrial Red. Early-mid '69 began Turquoise.
Crummy versions of this paint turn green..
Back when I did spinman's 340...after it ran in some... it went green, manifolds went pinkish grey. Never buying that brand again. Duplicolor perhaps it was..
The mopar paint can be old and watery...priming makes it pop better but the factory didnt prime... so idk anymore lol