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I always used LACO SlicTite Teflon paste, It is good on all types of pipe threadsI use oil base pipe dope on lots of threads more as a lubricant than sealant , it helps take things apart down the road and helps threads from galling when put together dry...
on compression, I dope both the threads and ferrel and dont have leaks unless the ferrel is damaged..
plus it will not hurt any small kids that decide to taste it :biggrin: