If your windshield or other stationary window is cracked or chipped you may consider replacing it yourself, but there are good reasons to have a professional automotive glass technician do the installation, mainly for safety and cost. The design of the windshield allows for safety features to reduce injury in the event of a collision, it is made of two panes of tempered glass with a layer of transparent plastic sandwiched in between, which acts to absorb the impact and prevent shattering that could cause injury. Fixed windows are also tempered to shatter safely and a professional knows how to install the glass for optimum performance as to an accident. Attempting to install the automotive glass without the required experience and tools can result in more risks. Cost is another consideration, as a DIY installation may end up being more expensive than hiring a professional although multiple windshields being broken during the process. Improper installation can cause air and water leakage, causing more expenses and stress. Therefore, it is advisable that whenever you have any kind of broken glass on your vehicle, you seek out the services of a professional automotive glass technician. For windshield chip repair, look up local laws with regards to safety inspections because some areas won't allow chip repairs. While severely damaged windshields need to be replaced, there are products on the market to repair chips, such as Loctite's BullseyeTM windshield repair kit that includes a syringe, pedestal and sealing adhesive to help make the chip transparent and prevent further damage. Always follow the manufacturer's instructions for optimum results.