Originally Posted by
tarheelnj
One other thing, if you're not clearing customs in SIN (which you won't be), you may get stopped at the gate for the flight back because you didn't check in at SIN and get asked the security questions (e.g., "did you pack your bag yourself," etc.) When I did a SIN mileage run a couple years ago, they pulled me aside to have someone ask the questions and mark my BP. Not a big deal, but don't cut it too close to departure time.
I'd just stop by the transfer desk on the way to the lounge. You pass right by there and you'll need return BP for lounge access anyway. They'll ask where you're coming from and what bags you have then put a little colored sticker on the back of your passport. Takes about 2 mins.