FAQ > Back Glass Knoxville's Finest Auto Glass Installation Center • How long will it take to replace my back glass? What we would call a normal mobile auto glass installation usually takes from 30 to 90 minutes. Installations that take longer  than 90 minutes are what we classify as difficult installations.  For obvious reasons it is not practical for us to do these types of  installations in the field so they do not qualify for our Mobile Service.  As a rule they require that the installation be performed  and monitored for a period of time in our facility.  Some of these types of installations are timely because they are done in  stages, some of which cannot be accomplished until the adhesive has cured for a minimal amount of time.  Most vertical set windows such as pick-up truck back glasses require being held in place by different  manners and for many reasons (paint damage being the main one) need to be done in and remain in  our repair center controlled environment until the adhesive cures for a minimum of 24 hours.  There are many different types of vehicles out there in today’s world and each of them have their  own peculiarities.  Your customer service representative at Phoenix Glass will be more than happy to  answer any questions you may have for your particular vehicle.  • Will you vacuum up the broken glass? Absolutely!  Don't touch that mess and risk getting cut.  We'll vacuum up your broken glass when we come out to do the job or  when we do it at our facility.  We do our best to make your vehicle the best we possibly can.  • How soon can I drive my vehicle after my glass is replaced? That will depend on the type of window as well as they type of urethane adhesive used to install the auto glass in your vehicle.  While most automotive grade urethanes rely on temperature and humidity to cure, the time required varies widely depending  on the manufacturer.  This time frame can range from 3 hours to 24 hours or more before your vehicle will meet Federal Motor  Vehicle Safety Standards and is considered safe to drive.  If you need to drive your vehicle sooner, a more expensive  chemically cured urethane can be used that will allow a 1 hour drive away time.  In either case, it's imperative that you follow  the manufacturers' instructions regarding safe drive away times.  Not adhering to those instructions could result in your injury  or even death. • How do I know your installers are qualified? Your Phoenix Glass auto glass technician keeps up with the times and processes a high degree of understanding of the ins and  outs of auto glass replacement.  They are familiar with the proper tools, methods of removal, preparation of the pinchweld and  possess the knowledge of the many different adhesives available that will provide the strength to hold the glass in your  vehicle.  Along with all that they also understand and use the proper methods that prevent leakage and rust around the  pinchweld where the auto glass bonds to the vehicle.  Phoenix Glass technicians have as much as 35 and no less than 15 years of auto glass experience and have literally installed  thousands of windshields, back and side glasses.  You can rest assured that your new glass will be properly installed and your  vehicle will be restored to the factory specifications or better.  • What kind of warranty do you have? Our Warranty covers defects in materials and workmanship for as long as you own your car.   (Pre-existing rust or body damage would void this guarantee.)  My Mercedes has a heated, laminated back glass with a stone break similar to what you see in windshields, can  it be repaired? Due to the method of manufacturing laminated heated back glasses cannot be repaired.  Repairing this type of glass can result  in serious personal injury.  When the heating element is activated the repair can create a hot spot (or short) within the glass  causing the glass to explode in that spot sending projected glass shards into the passenger compartment.  • My Ford Pick-up rear window is leaking, Can Phoenix Glass solve the problem? Yes we Can! Certain model year Ford pick-ups have a few issues to take into account.  To answer your question completely  we'll have to go into a rather long explanation of the 5 probable causes.