I may have forgotten to use soldering flux paste when I replaced a water valve on 1/2" copper tubing. It was in a tight place and sweating pipe is not something I do often. Some of the joints I attached on the ground but others had to be soldered in place, near the ceiling.
In any case, after I put the new tubing and valve in place and soldered it, I looked up and could not recall putting flux on one of the joints.
If I soldered the joint without flux and it does not leak should I leave it alone or redo it?