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
Not necessary, but recommended along with pipe thread compound.
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.
Pipe dope better solution than tape.
yes
Many fittings, except unions, require the use of teflon tape.
Teflon is an organic material.
Teflon is a compound made from carbon and fluorine. PTFE PolyTetraFluoroEthylene - polymerized C2F4
Yes, but only if it is necessary.
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. Teflon is a compound of carbon and fluorine.
Taape or joint compound on the threads the same as any other pipe fitting, but not on the threads where the two halves connect.
PTFAnswer Teflon is a trademark of DuPont and is commonly used for the chemical compound PTF or polytetrafluoroethylene.