I've never had a garden hose fitting seal water, let alone air. If it's a standard hose size I'd cut the ends off and put a good fitting on.
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https://www.fastenal.com/products/details/4202719Just out of curiosity where can you get 600psi garden hose? That can't be legit.
IMO, its just a bad idea all around.
Fluid pressure and air pressure are two different things. Water is nearly incompressible and air is compressible.
What is the difference between atmospheric pressure and fluid pressure? - Quora
This is the same thing using PVC for air lines.
https://www.oshatraining.com/compressed-air-hose-water-hose-clamp-pvc-pipe-OSHA-violations.php
I've used high end garden hose with a 90# air Jack hammer and a pull behind compressor at 120 psi with no issues other than is gets cut easily.
We used it for 45 days straight and at least 12-14 hour days turning a 2 story bank vault into gravel. Had 3 hammers going. The compressor was my buddies, and he does irrigation. He had the garden hose on there for system winterizations. It's the basic ware and tear that kills them before the pressure does.Great, first person I've met who as done it before. You the man.
How long did you use it for? Is that a common thing to do with jack hammers?
In our current environment of air quality due to Global Warming and legalization of marijuana, the air would probably deteriorate the water hose prematurely. Our water isn't nearly as corrosive.