Using this Noble painted trunk hole cover is a breeze. First, make sure the area around the factory holes on your Subaru WRX or STI (2015 - 2021) is clean and dry. Peel off the backing of the automotive - grade 3M adhesive on the cover and carefully align it over the holes. Press it firmly in place to ensure a good bond. When it comes to maintenance, just wash it with mild soap and water like you would the rest of your car. As for precautions, avoid using harsh chemicals on the cover as they might damage the paint. Also, be gentle when installing to prevent any accidental scratches on the cover or your vehicle.