threaded pvc leaks

[SThrash]

What type of pvc thread sealant do you guys use? I had to replace my 6 way valve on my sand filter and I used some rector seal thread sealant and the threads on both connections are leaking. I used a liberal amount on the male and female threads per the instructions. I made sure the threads were clean prior to applying. I know there has to be something better out there. I've made 2 attempts with this stuff with the same results and ready to try something different.
Thanks.

 

[partsman]

I use this on all my threaded pvc connections...

...I’ve never had one leak yet.

 

[jblizzle]

Thread tape is meant to be more of a lubricant to allow you to fully seat the threads. It does seem to work well on smaller fittings, but on larger fittings like +1" The Rectorseal usually works better than tape.

 

[partsman]

Thread tape is meant to be more of a lubricant to allow you to fully seat the threads. It does seem to work well on smaller fittings, but on larger fittings like +1" The Rectorseal usually works better than tape.

...then you’re using the wrong tape! All my threaded connections are either inch and a half or 2 inch. Absolutely no leaks.

 

[Pool_Medic]

Agree with the above, use that cheap white stuff and you’re asking for issues, plus most do not tighten enough.

 

[Panzer]

I typically use the Blue Monster thread tape as well (1½" PVC) with good results. However, I have had a couple of fittings over the years that just did not want to seal 'drip free'.
What I finally found that worked wonders was the Plasto Joint Stick this finally sealed even my most troubling thread leaks.
For best results:
1) make sure the fittings are bone dry
2) apply the stick (it's somewhat tacky) liberally & perpendicular to the threads
3) after making the connections, allow the fittings to sit for hour or so before pressurizing system.

Best of luck in finding a solution for you.
Respectfully,

 

[duraleigh]

This discussion continues on TFP now for more than 12 years. I will say this, "If you absolutely, positively know the only way to seal a threaded PVC joint, you are wrong."

I personally use Teflon pipe thread sealant and I am absolutely positive it is the only way to correctly make that connection.

Thread sealant or tape, they all work when applied properly

 

[duraleigh]

plus most do not tighten enough.

Perhaps. I do know for certain you will deeply, deeply regret cranking down hard on a threaded pvc joint