cement for terra cotta?

Hi, I wonder if there are any cements/glues that work with terra cotta?  I
lost every piece of terra cotta last winter from the tiniest saucer up to
my largest urns plus a strawberry pot.  They all made it through previous
winters here but I guess I was just lucky.  My husband pieced the largest
two urns (my favorites) back together and, believe it or not, they look
pretty good!  If there is a cement we can use that will hold them together,
I could then use them for decorative purposes, filled with popcorn packing
and a few lightweight pots of annuals set in the top.  (They used to sit on
either side of the front entry, filled with soil and plants, summer and
winter -- but we've now put composite terra-cotta-look pots in their place.)  

How about some suggestions for cementing together these big rounded urns?
We've wondered about epoxy. and/or coating the inside, or the outside with
(what?) etc.   The smaller pots, etc, will just go the usual broken terra
cotta route.

Alyce Elliott
northern NY zone 4

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