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).

Plastering can seem like a daunting task for even the most proficient of DIYers. We’ve asked Which? Trusted Traders for their expert advice on how to plaster a wall, or just fix holes and cracks in ...