I painted my daughters bedroom last summer with white paint. For the last couple of months parts of the bay window wall (right slope wall) has been turning yellow and crusty. I'm paranoid about it being damp. It is a plasterboard wall that was battoned onto the existing wall. As the cottage is over 100 yrs old the wall was not a good surface for plastering. Is it damp or a leak or does this happen with white paint.
Thanks
It is the right hand side of the bay window.
Thanks
It is the right hand side of the bay window.