"Bill Lee" wrote in message
...
Greetings all;

My brother-in-law just bought a approximately 30-year-old house. Had a
number of plumbing problems I was able to fix. However, a leaking "T"
joint
in standard half-inch copper pipe has resisted all my attempts at repair.
I
have done the typical intensive sanding, fluxing and re-soldering several
times with no success. This had always worked for me in the past. All
pipes,
etc. look in good shape.


You probably overheated the joint. Best bet is to cut it out and redo it.