Under my trailer, some 1/2 inch soft copper sprang a leak. It's not in a great place for working. I called the trailer park, and they sent thier man out to shut off the water. I cut out about a foot of tubing, using a tubing cutter. I sanded the ends of the tubing, using some sand screen. I used two compression unions to put the new tubing in. Well, hours later one end of one fitting is dripping, about one drop a second.
I tried tightening the fitting down a little harder, and it's still dripping. Any good old country wisdom for stopping a compression fitting from dripping?