Conductive grease for thermocouple?

Built myself an electic HLT, and I want to use my Johnson temperature controller.  I added a thermocouple in the side, and have heard that you should use conductive grease for the best performance.  Any recommendations on the type and where to get it?

Thanks.

Any of the greases you can get for installing a CPU on your MOBO will do fine.  You can spend a lot for the high purity stuff but you won't see any performance delta.

CR is right, any decent heatsink grease will do. There are some that claim to be better and have silver particles but you are just paying for the silver in the grease.

Just search for white thermal grease and you will find all that you need.