Hello all....I have a question but what to expect when putting in new pipes on the main water line coming to my house....My main valve is Shot and my friend and I attempted to replace it to today only to find out that we could not find a replacement.....the house is 80 years old and have anceint pipes...We end rebuilding the piping in the area.....Using various pipes....My question is this....WE tightened up all the pipes very well.....and applied teflon tape....Once completed, we turned the water back on and notice that the new pipes were somewhat leaking....Not a alot.....as if it were sweating out water from where the joins are.....I heard from someone that they willl seal themselves...is that accurate??.....I hope this was not toooo confusing