What is recommended for Connecting 1" Schedule 80 PVC threaded fittings to prevent leaks. I have tried pipe dope, but leaks developed between nipples and elbows. Do you have any suggestions.
We use liquid sealant all the time with great success at 1-1/2" diameter and less.
Make sure you are coating the threads completely and evenly.
Some dopes require coating both male and female ends over certain sizes.
Maybe try a different brand.
Might just use teflon tape instead.
Plumber we know for a large local company uses teflon (to seal) and pipe dope (to lubricate) at the same time although we do not practice the same.
If these don't work, look at your threads and make sure they do not have a scratch or nick in them.