If they told you they can apply a ceramic coating and deliver the car same day, I hate to say you got robbed! I do detailing for a second job, and a true ceramic coating takes two to three days to prep, apply and cure! The whole vehicle must be decontaminated and a clay bar cleaning. Then the paint needs to be polished and the surfaces need to be defect free. Then a denatured alcohol bath must take place. Then the coating is applied by hand one panel st a time. Once the coating has been applied, depending on the brand, the vehicle must be exposed to UV light for a few hours to start the curing process. Then the vehicle cannot come in contact with water for at least 24 hours. This process on a Yukon should run anywhere from $1800-$3000 depending on the apication company.