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Does anyone have a fail safe method for assembling PVC pipe Threads! I've gone through 2 rolls of Teflon tape with no luck. All my 3/4" threaded joints work, but the 1" mainline joints always seem to leak...

Here is what I've been doing:
1) Clean threads with dry cloth
2) Apply Teflon tape to thread at least 3 layers thick wrapping clockwise around the male threads applying tension to the tape to help it conform to the threads.
3) Assemble to finger tight
4) Turn 1.5 to 2.5 additional revolutions
5) Turn on water to find a slow leak (one drip every few minutes)
6) get mad, throw tools
7) Start over at step one, this time sitting in a mud puddle.

After a few attempts, I started to look at my fittings. The quality of the PVC threads is horrible. There is major flash and molding mis-match. Is this standard? Should I take these fittings back to the place I bought them?

In the interim, I've changed out as much of the threaded joints as possible, or converted them to brass and copper. However, this is expensive and I would prefer to use PVC in the future...

Any suggestions would be greatly appreciated...

Thanks

I guess I chose to use threaded joints because I thought that these joints would help make the system more serviceable.

I've Got Threaded Joints in the following locations:

CONSTANT PRESSURE:
1) At the main take-off: 1" Mips Copper Adapter to 1/4 turn PVC Fips Ball Valve
2) At the exit of my Ball Valve
3) At both sides of my Basket Filter

DOWN STREAM OF VALVES:
4) At every Sprinkler Riser
5) At the Pressure Regulators for the Drip Lines

I've can replace the PVC 1/4 turn Shut-off valve with a Copper one, but it's more expensive. I really don't want to buy another pricy filter to replace my plastic one.

Does Pipe dope work?