I asked here a few days ago about what caulk to use around my exhause pipe.

I just called 3M and they said that 5200, 4200, and M101 would all be
OK in environments up to 200 degrees. After that they will start to
soften.

The other difference (which I knew to some extent) is:

5200 - Is for permanent bonding.
4200 - Bonds but forms a weaker bond that can be taken apart is necessary.
M101 - Does not bond items at all...it only seals.

So for us M101 should work and 4200 (which I have on hand) is
what I will probably use.

Gary