It is not a great idea to reseal an A/C condenser. It should be replaced to ensure a long term repair. The materials used on todays condensers are lighter weight and don't hold up well when they are repaired.
Yes, you can, but it's probably going to cost more to repair it then to buy a used or new unit. heres a couple of links. http://www.partsgeek.com/gbproducts/DC/3348-05139020.html?utm_source=google&utm_medium=ff&utm_content=DN&utm_campaign=PartsGeek+Google+Base&utm_term=2000-2003+Chevrolet+Impala+A%2FC+Condenser+APDI+00-03+Chevrolet+A%2FC+Condenser+02&gclid=CPuvyrCPjbcCFQFp4AodyzMAqA