In the process of remodeling a bathroom that has an exterior wall, I had to move some plumbing. This necessitated cutting away a piece of drywall 28" high by 48" wide. I moved my plumbing and while fitting my new 1/2" drywall, I noticed the old drywall nearest the exterior wall is slightly thicker than the new drywall. However, the old drywall that is farthest from the exterior wall is flush with the new piece. I also noticed when cutting out the hole I didn't cut across any drywall seam, meaning that the old drywall at that location was installed horizontally. Is this normal? The house was built in 1982. The question is, will I ever be able to mud and feather such that it will be difficult to tell the uneven thickness when looking at it side-on, or is this a lost cause and I should just do the best I can and live with it?

OK, I have this fixure over my sink: [url]http://www.joevb.us/DSCN2663.JPG[/url] It is a light fixture, the blue box doesn't have enough drywall to hold on to and dowsn't mount properly (only one side is attached). So when I put everything back together you see the edges of where the drywall is missing. What I need to know is, what is the best way to fix this so the blue box will have enough to grab on to and mount properly so I can then replace the fixture with something that will look nicer? Thanks Joe