Or send PM to Jon Goodman here, re: the foam. With respect to the shutter, more likely there's something that's slowing down the closing curtain. I had an FTn that a tech went overzealous with the "L" part of CLA. Overlubed the shutter, which, eventually required that I buy a replacement shutter during an overhaul I had done about 11 years ago.
I wouldn't bother overhauling one, unless you have sentimental value in it and don't intend to sell the camera anytime in the next 10 years or so.
1) They're still extremely common. So, they're worth almost nothing.
2) Due to that, it's cheaper to buy another FT2 that's in good working condition, then chop yours up for parts, instead of repairing yours.
If you want something similar, but don't mind losing the mirror lockup and mainly have AI or newer lenses, consider picking up an FM. A bit more modern, but still has the Copal Square S shutter.
-J