Stuff for making minor repairs to cigars?

[Ringo]

I know that there is something that you can buy in the baking section to make minor repairs to cigars. It's called something like Certo, or maybe that is even the actual name.

So - what is the name of the stuff if it is not Certo, and can it be used to mend minor spots where a small piece of the wrapper flaked off, to seal it so that no more of the wrapper will come off? And what exactly is the stuff, do you have to mix it or does it come in a tube or what?

Thanks