If you do have scratches on the surface, it may be better to have headlight restoration specialist handle it, but some people have successfully used an electric sander to gently smooth away some superficial scratches. This technique can cause more damage than intended if you aren't careful windshield replacement and is not suggested for novices.
Use a glass cleaner to wipe the area around the chip and allow it to dry. A rag has to be placed under the chipped area, this will prevent any surplus repair substance from reaching the body paint or smearing the fix auto glass repair.
Of course you want to be sure to test drive the car. Also, as part of your vehicle background check, you want to be the person that starts the car from a cold start so you can take notice of any problems that may occur on start-up. I once purchased a vehicle that the owner had "warmed up" for me only to discover later that it had wiring issues that cause the battery to drain after sitting a while. Don't let this be you!
There are many different repair kits that can be used for repairing your windshield. One excellent windshield repair kit is the Fix-A-Windshield, Do-It-Yourself Repair Kit. It comes at a very affordable price of $10 and contains all the necessary tools that you will need for repairing cracks in your windshield. This includes the clear resin bottle, and an air suction tool that removes air in between the break of the crack.
Once your kit arrives, you'll need to read the training manual and then watch the training video. Get yourself a used windshield to practice on (you should be able to pick one up at the junkyard or a glass replacement shop). You can usually get it free.
Auto glass repair shops are also qualified to fix not only power door but manual power doors as well. They are able to come in and tend to any problem you have whether electronically or other. Having a window that is broken can be a very large hassle and having a service there to fix it quickly and cost efficient can be a very beneficial.
Windshield chips and cracks can usually be patched for under $90. You're going to pay hundreds to replace the whole thing. In this case, your best bet is to keep hunting for auto insurance quotes and pay the repairs out of pocket.