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

Good information. 5200 seems to be commonly used for all applications whether
its remarkable adhesive properties are required or not. 5200 is a powerful
structural adhesive which is mis-applied when only a sealer is required. 5200
has been known to de-laminate fiberglass during removal attempts.

Gary Warner wrote:

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

The group of people with my class of sailboat use 3M 4200 to re-bed fittings
etc.