Using these headlight overlays is easy. First, mix one drop of dishwasher soap with water and use this solution to clean and wet both the overlay and your headlight. This makes it easier to place the overlay in the right position. Put the overlay on the headlight and use your fingers to push out the water. You can use your nails to make sure the edges are well - attached. After that, you can use a heat gun on a low setting or a hair dryer. This helps the vinyl stick better by drying out the soapy water and allows it to wrap around the edges nicely. Remember to let the overlay sit for 24 hours so it fully sticks to the headlight. Once it's dry, you don't have to worry much. These overlays can handle automatic car washes and most power washing. Just avoid using very abrasive materials when cleaning your car to keep the overlays in good condition.