Cement for Post War Smoke Units?

I've tried to find the cement specified. I don't think it is available any longer.
I don't use anything. I don't think it's necessary.

Like CW, I have never used anything and never had any problem.

If memory serves, the cement used was similar to that used on furnace ducting. Not really needed, as the loco shell clamps down on the smoke unit if everything is fitted properly.   

Mitch 

It was Sauereisen #63 Electric Heater Cement.

The company is still around, but that particular item is not listed on their web site.
There is probably another product that would serve the same purpose, but the prices were rather high on the one site I found that sold Sauereisen product retail.

I'd like to have a can of the cement from an old Lionel service station, just for show.
I wouldn't use it.

As I wrote earlier, it really isn't needed.  

Thank you all for the responses, gentlemen.  I greatly appreciate the help.

I have worked with various Sauereisen products for many years. It is a family of high temperature adhesives that go up to about 2200 F.  Mr. Sauereisen and George Westinghouse got together and developed the multi part high voltage insulator that is used on transmission lines.   They are located just north of Pittsburgh.  I believe that the #63 may have used asbestos fibers as a reinforcement, so it is no longer available.   In all the smoke units that I have worked on I have never seen heater cement used, so I have never been sure what the reference the Service Manual was refering to.

  In all the smoke units that I have worked on I have never seen heater cement used, so I have never been sure what the reference the Service Manual was refering to.

Lots of the postwar smoke units I've rebuilt had some sort of grey material around the seam between the cap and the pot. I don't know what the material is.

It can be rather difficult to chip out.