Outer Limits 4x4 Board

Good evening...

There is a bit of cancer in my roof which has been repaired (or maybe just painted) but it's starting to bubble through anfd there's also some holes from ambulance lighting which have simply been plugged with rubber grommets.

I'd like to treat it inside and out, but is there any chance I'm going to be able to remove my interior roof lining and keep it in one peice or is the foam backing just going to fall apart?

Any info on technique would be greatly appreciated... If there is one!

depends what vehicle your takling about in your sig it says you have a 97 something, something that new should be ok. but the foam will be glued onto the roof skin and youll have to be careful to get it off