1. Marsh is a super permanent ink, basically the only way to find it is online.
2. You have to wear gloves, otherwise theres no way to use it, it shouldn't eat through, but you should bring a couple pairs of gloves just in case and if you want double layer them even though that seems a little extreme to me.
3. Thats the way to go. Thats the way I roll. Unless it's an area that Mr. Buff goes to frequently, then you should use that. You'll save a lot of time and money. If it is a place that gets buffed frequently or you won't be back for a while, use an ink that leaves a ghost so that it lasts. Pilot ink has left a ghost everywhere that I've used it. Just mix the paint and paint thinner until it gets thin enough for you based simply upon if you want it clean or unreadably drippy.
Keep it real. ♠
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No, Marsh is not a super permanent ink. It is quite easy to buff off walls, actually. Marsh is known for its jet black color, that will never fade - not it's staining power.