Thanks a lot for the replies! I have actually done a lab test earlier this year, which set my AeT at 153 bpm. If I remember correctly, they didnt moisten the HR belt for that, and I always assumed my sweat should be sufficient to get accurate readings.
Also, In most of my base trainings I try to keep HR below 150, just to be sure, so I assume I was still below AeT even if the HR readings were a bit off.