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Your boss is right. Use the time that your putting the tape on instead to check for proper threads. Using both is really a waste of time and material. It can cause inexperienced workers to overtighten the joint stressing it and breaking it later.
I agree. Use a good quality pipe dope only- without tape. Thread quality is very important especially in the larger pipe sizes. I only use tape when connecting directly to the appliance just so I don't get pipe dope in the screen.
Don't try to cut costs using a less expensive fitting supplier. There's a lot of crappy foreign products on the market these days. The money you save up front won't pay off if you have to change one 90 in the middle of the line because it cracked.
I've used just dope, just teflon tape and a combo of both on pipe up to 1.25". Good threads is all that was important. I like teflon tape because I don't make a huge mess with it, but mostly I use pipe dope because it is always in the toolbox.
You know when the pipe is going together bad! Take it apart and fix what ever is causing the fitting to not feel right.
I like tape and blue block. I learned this from a great book written by a Berkley plumber. Plumbing a house by Peter Hemp.
Many experienced plumbers have written good reviews on His book. Works for Me and as Peter says " You can back off a fitting and never have a leak with this way ".
I can build anything You want , if you draw a picture of it , on the back of a big enough check .