I have a main water feed pipe to the electric shower that has a very small weep on a solder joint. It produces a small drip about every hour or so. The joint is at the end of an S-curved pipe and appears to have been flared by the original plumber to allow the next pipe to join on without a connector, then soldered. This was fitted before we bought the house and I would extimate it is 15 years old. I therefore can't simply replace the fitting, or the run easily, so is there anyway I can seal the joint?