On Thu, 22 Mar 2007 20:58:29 -0400, alexy wrote:

I have a buildt-in bookcase with a 1/2" ply back that [nearly] meets
up with a wall that is slanted in at the top at 45 degrees. The back
of the case and the wall are painted with the same flat wall paint. I
want to put a cove at the junction of the plywood and drywall,
probably with a 2-3" radius. That means that the material I build the
cove out of will be up to 3/8" thick. I have both plaster of paris and
drywall joint compound. Which should I use and why?

Neither a flexible paintable caulk, it will not crack as joint
compound or plaster will.

Mark
http://home.mchsi.com/~xphome/