If it's going to be a permanent, it wouldn't be a bad idea to at least solder every other, or alternating rail joiners. An alternative to soldering rail joiners is soldering a small gauge wire from track section to track section.
All of these suggestions are for any type of track, be it flex, sectional, Tru Track, EZ Track, etc. Poor electrical connection is the scourge of model railroading.
If you don't know how to solder, you'll need to learn. It's not that hard, and it's somethng you'll need to use quite often in model railroading.
Rotor