Quote:
Originally Posted by MT Alex

I use it on all fittings, I just do a tidy job of it. It can't hurt, gives you another insurance against leaks, and if plumbers use it means it works. You just have to be careful when using it with acrylic, as you don't want to make your fitting so tight that it cracks or splits.
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Almost exactly. If you use it and you use too much it can crack the threads on Acrylic, Acetyl, a little harder to do on POM or Lucite. This is why they use o-rings now.
If you have an o-ring that doesn't seat right, or it's cracked. An old plumbers trick I learned in Germany, wipe the o-ring down with petroleum jelly, take it off until theres a slight sheen, the coat the edge of the fitting with it outside of where the o-ring sits. Carefully put it on, it's slippery now, so make sure it doesn't pop out, seat hand tight and it should stay until you can get a new o-ring. This is perfect on old washing machines and whole house water filters.
Clear silicone is nice too, just gotta pluck it all off when you take that fitting off and re-apply.
I don't use anything but o-rings, I'm on my fifth loop without leaks.