Originally Posted by
critten
i know if there is secondary customs security at the gate then you cannot buy duty free(couldn't even bring a newly purchased water bottle for the long plane ride!) - I remember AMS and a few middle east cities with this policy. BUT I just got back from GRU last week and you can buy in the terminal and put in carry on no problem - well no one told me anything since there is no secondary security.
This is probably because GRU has a strict liquids check to enter the airport and for transit security, so all liquids in the terminal (over 100ml) are theoretically approved.
cf. EZE, SCL, etc. where there is not a general liquids ban, so there is gate secondary for liquids-restricted destinations.
The HKG restriction really surprised me. I was planning on getting rid of my HK$ at the airport for a bottle of Scotch.