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I had an issue recently that I've never seen before and any help or advice would be greatly appreciated. I used a Larsen acrylic primer on gyspum walls as instructed on product (walls had been skimmed 8+ weeks previous and moisture tested prior to sealing and tiling). 18 months later and it seems the sealer has not bonded to the wall adhesive. Wall was coated with a 12mm trowel and a standard set flexible adhesive used, the tiles are 900mm by 150mm thin porcelain and within weight limit of plaster. Tiles have now come away from the wall with 100% of adhesive on the tiles and 0% left on the wall with sealer still appearing tacky on the walls. Walls are tiled 1.2m high around the room and the issue is only where sealer was applied to gypsum walls,other walls are scratch coated and solid as should be expected. Usually removal of tiles like these should take plaster and all with it, is this is a sealer failure or am I missing something? Apologies for the long post but I'm in the trade a long time and never encountered this.