I live in an area where the foundations MOVE frequently. My 20 year-old house has two vaulted ceiling areas. NOT a good combination. The seams have been repaired a couple of times. In addition, the ceilings have the popcorn texture.

I am looking for a new solution. Does anyone know of a "flexible" molding that might be easy to use to cover the seam. Any suggestions on how best to secure such a thing?