I've recently tanked my basement. I applied the tanking in numerous coats. After a week or two all of the walls were completely dry. I've then dabbed celotex insulation boards onto the tanked walls with drywall adhesive. I then dabbed plasterboards onto the insulating boards with drywall adhesive. I've put finishing plaster on All of the walls. It's been a couple of weeks and the walls are still not drying. I cut out a square at the bottom of one of the walls to have a look and see what's going on underneath. The drywall adhesive onto the tanking is still soaked. It's so wet that it's like a paste. I figured that the moisture in the drywall adhesive has no where to go as the tanking is impermeable. I'm thinking will it dry eventually given enough time or have I missed something? Any thoughts?