I don't have any problems with threaded leaks, tapered to parallel or single lead torn threads. I use Rector seal #5, never had a drip or weep used it on 1/16 to 6" pipe, 3" to 6" a couple hour wait before pressurizing.
Used at hydraulic pressures over 10,000 psi.
<<<<<<NO OXYGEN>>>>
The manufacturer recommends RectorSeal No. 5 for piping carrying:
Gasoline (Leaded Unleaded)
Gasohol (unleaded Gasoline and 10% Alcohol)
Natural Gas
Air, Compressed
Heating oils
Nitrogen, Gaseous
Ammonia- Gaseous, Liquid
Helium, Gaseous
Petroleum Solvents
Aliphatic Solvents
Hydraulic Oils
Soap, Liquid
Caustic, Dilute
Hydrogen, Gaseous
Steam
Cutting Oils (Low Aromatic)
Inert Gases
Vegetable Oils
Diesel Fuel Oil
Kerosene
Water (Hot or Cold)
Freons
Liquefied Petroleum Gases (Butane, Propane, Mixtures)
Mineral oils
Not recommended for oxygen.
I use it on Hvac. plumbing and sprinklers for fire service just about every where.
This isn't an ad it's what the trades use.
Also after many years the threads come apart with a little extra effort and are still clean.
Here is a link to their site
( the ** are tt keeping from a direct link)
h**p://www.rectorseal.com/files/212/dsno5.htm
Thanks hope this helps someone.
dwdw