Using the DeWalt DWA8280 flap disc is easy. First, make sure your grinder is turned off and unplugged. Then, attach the flap disc securely to the grinder according to the grinder's instructions. When you're ready to start, turn on the grinder and gently apply the flap disc to the material you want to work on. Move the grinder steadily for an even finish. Remember, always wear safety goggles and gloves to protect yourself. As for maintenance, after each use, clean the flap disc to remove any debris. Store it in a dry place away from moisture and extreme temperatures. This will help keep it in good condition and ensure it lasts as long as possible.