I recomend taking some course grit sand paper such as 80 - 100 grit and roughing up the aluminium shaft, then yes smear epoxy on the shaft and get some in the holes that it goes into. Remember just rough the surface of the shaft as you do not want to make it smaller. This gives some texture for the epoxy to adhear to. make sure you also put epoxy on the root ribs and the guide pin near the trailing edge. Have a bottle of rubbing alcohol and a rag/paper towels near by. to wipe of the excess epoxy that will squeeze out between the joint. Using 30 minute epoxy gives you the most time to adjust things. I will admit the last one I did (for my current student) I used 15 minute, however the 30 minute will soak into the wood better and give you a better bond.

Make sure you tell us how the maiden flight goes.