Not necessary, but recommended along with pipe thread compound.
yes
Many fittings, except unions, require the use of teflon tape.
You do not need tape on any flared fitting, brake or regular. The brake line and the fittings are different size and thread type than regular copper line and fittings. You can't mix them.
Yes, otherwise you will have leaks
The use of PTFE tape depends on the what you'll be using it for. PVC products dont need as much as what a brass or copper fitting may require
Yes, but only if it is necessary.
yes
Many fittings, except unions, require the use of teflon tape.
No, teflon tape (and pipe dope, for that matter) should never be used on flare fittings. They are designed to seal without tape or dope, and may actually leak if tape or dope is used.
Any pipe dope will work but Teflon tape is a lot cleaner.
You do not need tape on any flared fitting, brake or regular. The brake line and the fittings are different size and thread type than regular copper line and fittings. You can't mix them.
It's real important to apply your Teflon tape in a clockwise direction which coincidentally is the same way you thread on most of your fittings.. If you apply the tape in an anticlockwise direction it will unravel as you screw on the fitting which will render it useless. To apply , this is what l find the easiest.
Pipe dope better solution than tape.
Teflon tape only, no joint compound. Two or three wraps is plenty... Yes agreed, teflon tape will make it easier for repairs in the future
Yes, otherwise you will have leaks
Pipe joint compound or Teflon tape
Teflon tape is a solid.