Picked up a Ship Ahoy recently. Relatively nice backglass. All but no flaking.

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As usual, some of the old black padding that was stuck to the light board has adhered to the back of the glass. In a few places - it's reacted to the paint and discolored things from the front.
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I assume there's no way to safely remove the padding, and this is a case of damage done. I sure as Hell don't want to make it worse.

Is there anything I can do to mitigate things? I realize it took 45+ years to get to where things are now and it's not likely to get much worse if at all while I own the game, but it would be nice to do what I can to minimize additional damage.

With other EMs, I've not had this discoloration and just added new felt padding to the light board in the same spots that it was in previously. It seems maybe this isn't the best idea in this case?

Long post shorter - what's the best way of proceeding here that doesn't involve me risking further damage?

Also - I'll be putting some comet warm white retros in the light box. Any particular reason to triple thick the blackglass given that it's not really flaking at this point?

Definitely leaning that way. A part of me wants to rub off some of the black crap just so it's not constantly making a mess, but I'm afraid that if I go too far light would shine through and it wouldn't remain fully opaque.

Think I'm just going to add new pads in a few new opaque areas and leave the current old bits as is. Maybe it would cause more issues with the paint over time, but I'm sure I'll only have this machine for a year or two.

Any thoughts on whether to triple thick or not?

I'm no pro by any means, but I've used litle buts of wool (I think) furniture pads that would go under the legs of a table. Found some that are just thick enough to keep a backglass from rattling, and as far as I can see - no chance of adhering to the paint.