Here is the confusion.
Take a spherical conducting shell of a certain thickness.
When a postive charge is introduced into the shell the inside surface collects negative charges and the outter surface postive charges. So far so good.
Now gauss' law tells be there is no field in the conducting shell and thus its outter and inner surfaces must be equipotential.
However the inside surface has negative charges and thus is at a negative potential and the outter surface has postive charges thus is at a postive potential. And thus the inner and outter surfaces have opposite signs for potential and thus are different.
This seems to falsely contradict the earlier gauss' law conclusion which I know is correct.
Where did I go wrong?