Finding Durable PMD Blue paint has been a big deal for decades. All the PMD Blue metallic seems sensitive to antifreeze, brittle if sprayed thick or hot-oil contact, not bonding to primer if sprayed thick or hot-oil, and exhaust burn, and Gasoline stains.
The best paint i had for durability was Martin Senour " Johnson Outboard Green". It looked like an oil-aged PMD Blue metallic. Or exactly like the 1968 Paint batch on some Pontiac V8s. The paint was impervious to antifreeze, gas, and oil. Didn't peel.
Buut it seemed discontinued or just not on-shelf. Formulas probably changed across the board.
The Bill Hirsch engine paint sounds promising, and wonder what you get if PMD Blue is sprayed thin on a tacky Bill Hirsch Paint. Blending paints that way has been a rewarding try for me on Rims.
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