I have a problem with a renovation on an old tower. The tower has lovely old wooden post and beam construction. I have installed purple sheetrock which is cut to butt up to the beams and used fast set sheetrock compound on the edge next to the beams to fill the gap. Once everything was very dry, I painted the sheetrock with a mold resistant primer followed by a high quality cover paint. Now the paint is peeling off in sheets, typically starting where the sheetrock meets the exposed wood beams. Specifically the overcoat and primer are peeling off in one sheet with the primer side showing the surface of the purple board paper.
Has anyone seen anything like this? Is it an issue of the primer, cover paint, or joint between wood and sheetrock? As I will have to strip off the existing paint down to the sheetrock, is there a better way to paint these walls?