Tried using a escape board for the first time and ran into a major issue.
Hive is 2 deep brood boxes, excluder, 2 deep supers inner cover that has been notched for a top entrance and a migatory lid.
Removed the 2 supers, place the partially filled one above the excluder, the escape board then the full super. Reversed the inner cover and covered the feeder hole so there was no access through the top entrance put the lid on and came back 2.5hrs later.
When I lifted the lid there were 2-300 bees that had entered through the top but couldnt get in to the hive. When I popped the inner cover there must have 5000 bees come boiling out. Walked away and a few minute later would have only been a few hundred bees left in the box.
I knew they were using the top entrance but didnt realise to what extent and the thought never crossed my mind that with bees using both the upper and lower entrance I would need 2 escapes to clear it while still on the hive.