How to use: First, clean your hands and the area where you'll install the overlay. Then, get some soapy water ready. If the alignment of the overlay isn't right at first, you can use the soapy water to slide it into place. Once it's in the perfect spot, use your fingers to push out all the water and air. You can also add our StickerFab Application Fluid for a better application. Precautions: The water only needs a small amount of soap. You can apply the soapy water to both the lens and the back of the overlay. When using a hair dryer or heat gun to speed up drying, be careful. If the heat burns you, it can damage the material, so use light heat. Maintenance advice: Keep the overlay clean. If it gets dirty, you can gently clean it with soapy water and a soft cloth.