Fixing small leak in copper tubing

I have the smallest of small leaks in one of the copper supply lines I attempted to put in for a shower. I had one earlier--same spot if you can believe it--and ripped that one out and started all over. Don't want to do that again, because with all the adjacent connections that I also had to replace it took me a good 4 hours. Any easy fixes? I also, with the earlier leak, tried to sand down, re-flux, and re-solder to no avail. This cold water line for some reason does not completely drain when I turn the water off (always seems to be a trickle) and I think that prevents me from getting it hot enough for a good solder melt when there are no cuts in the tube to use bread. Could I use a solder for this small patch that melts a little easier and might find its way into the hole? Maybe 50 tin/50 lead? The joint that's leaking is also pretty close to some other joints, so extended heating might start a remelt of the solder that did take. Complete novice here, so any suggestions would be great.

If you have steady water,

Open up all fixtues in the house so they can drain down.
It's like taking your thumb off of a straw that has water in it.

If they are left in the off position, they will drip slowly all day.
If the water shutoff doesn't shut down, turn it off at the meter.

Makes sense. Thanks. Any suggestions for trying the re-solder without starting over anew?

do like terry say

you might get lucky and just hit the pipes with
flux and solder......

the main thing is to open the hose bibs outside,

open everything that is down below where you are soldering
to get the water to leave you alone and drain out elsewherre.

John22207 said:

Could I use a solder for this small patch that melts a little easier and might find its way into the hole? Maybe 50 tin/50 lead? The joint that's leaking is also pretty close to some other joints, so extended heating might start a remelt of the solder that did take. Complete novice here, so any suggestions would be great.

Click to expand...

Do not even think about using lead solder in a potable water system...