Check the size of your 1/2-in. plywood backing board. Then, cut the fiberglass window screen to be eight inches larger than it in both directions (so there are four inches of overhang on each side).

Plaster, a decorative wall coating of lime, sand, and sometimes fibers, has been around since the beginning of time—and so has plaster repair. Although subject to cracks and bubbles, it's a durable ...