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).

We put approximately 1 kg of plaster into the container where we will make mortar and obtain a fluid consistency with water. We make it so that there are no air bubbles and no lumps. To fill our sock ...