Bull nose corner bead
I am using bull nose corner bead to finish around a window. When I come to the 90 degree corners, the just don't come out right. There are gaps. SHould I mitre the corner bead or what is the best way? What are the angles? I cut a 45 on each piece, but the angle is no where close to matching up. I assumed that since the angle is a 90 that two 45's would work. Please Help!