Join Date: Feb 2013
Location: SFO, MNL, SIN, HAM
Programs: UA GS, SQ PPS, IHG Plat Amb, Marriot Gold, Hilton Gold, Club Carlson Gold, Accor Plat
Posts: 488
AirAsia is pretty strict, especially at check-in counter (although I have seen people bring everything including the kitchen sink onboard at smaller airports). I would not recommend to show up with overweighed bag and hope to get away with it. They might force you to check it, the airport fees are steep and it's time-consuming as you have to go to a different counter to pay...
What I have done in similar situations is to pay for a checked bag and then ask to bring my overweighed bag (correct size) onboard. I always was allowed to bring it onboard...