Using these fender flares is easy. First, you'll need to prep the area where the flares will be bonded on your Subaru WRX or STI. Make sure the surface is clean and dry. Once prepped, place the flares in position and check the fit. Do any necessary adjustments for a perfect fit. Then, bond the flares into place using a suitable adhesive. When it comes to painting, choose a paint that matches your car's color. As for maintenance, keep the flares clean by washing them regularly with mild soap and water. Avoid using abrasive cleaners that could damage the gelcoat. Remember, these are made to order, so expect them to ship 2 weeks after you place your order.