The tank is toast long before water can wick it's way to the inner liner. Corrosion is hardly worth worrying about. Afterall, that's the point of this style of tank, less corrosion.
The whole tank is coated with a hard epoxy. It's watertight and hard as stone. When that chips, it's pretty obvious. And the fiber wrap will puff out and stretch. A tank like that will kaboom if it's full and you hammer it on rocks a few times. The inner aluminum liner can't withstand 4500psi without the wrap. When they do go up, usually it's a crack that harmlessly vents, not enough force to hurt someone, unless they fall right on top of it.
You'd have to be quite careful with a scuba tank like that, you can't bounce it off rocks like a steel tank. Fire department tanks rarely get much use. The training tank are oftne singled out and replaced often.
These tanks are common in paintball tournaments. It's rare for one to blow up. Noone really tech inspects them.....ever. You just need to keep them "new looking". Usually a thin tack cover similar to a rashy wraps the tank when in use.
Painball markers are quite fragile. If they weren't, I'd venture to guess that these fiber wrapped tanks would have never caught on. So the tank, ironically, has an easy life here. Running and sliding into a bunker looks like a guy falling down without wanting to spill his beer.
