How do you repair a freon leak in a refrigerator?

Get putty from Auto Zone or Wal Mart, Epoxy Gator and JB Weld Stick are the 2 common products to fix leaking. I came across this article, that guy used Permatex Proxy though: http://www.simonlee.net/blog/archives/918 But not sure if this kind of fixes will violate the local building code or insurance policy, I am not expert, but I know Putty does work.