The rainbow effect of the window film depends on the intensity of light passing through the window film. Window film can Block 99% of UV rays,anti-glare, protect your family and indoor furniture Semi-Privacy Protection,3D window film not only does it add an attractive design to your home but it also offers some degree of privacy.( Not Suitable for Bathroom Use) This privacy window film with glue free design cuts down chemical release drastically, minimizes the damage to your home and the environment. You can apply this static window film to Smooth and Clean Glass Surfaces in the Balcony, Living Room, Bedroom, Office, hotel, etc. Installation Instruction: Step 1. Measure the length and width of the window and cut the film into a proper size. Step 2. Clean the surface thoroughly. Keep the window clean. Step 3. Completely wet the window glass with soapy. Step 4. Peel off the films back cover. Step 5. Paste the film to the window. Step 6. Squeeze away water and bubbles with a smooth tool, such as credit cards. Step 7. Cut off excessive edges after application if needed. The adhesive effect of the film may NOT be good in winter. before application, use hair dryer to make it soft( heat resistance is under 176℉) Privacy Window Film: The semi-privacy window film enhances the privacy of your personal space by preventing people outside from seeing directly into the room and obscuring the view from the outside. It is characterized by the fact that the further away you are, the better the privacy effect, so it is not recommended for bathrooms Glue-Free and Removable: The rainbow window stickers are non-adhesive. They can be installed directly with water and reused many times Special 3D laser design: The window film itself is practically colorless. However, once installed, a rainbow of visual effects will appear when sunlight hits the privacy film due to the special 3D laser design UV Protection and Energy Savings: Made of high-quality vinyl, the window film effectively reduces annoying glare, blocks over 80% of UV rays, protecting your skin and furniture from direct sunlight; the window film lets in filtered natural light and creates a softer ambiance Easy to Apply: The Window Privacy Film utilizes static cling technology and can be easily to installed in just a few minutes! Spray a generous amount of water on both the window and the back of the film to adhere securely.Never worry about damaging the film itself or leaving nasty glue on the glass surface again