Applying Flomasta Liquid PTFE To Threads

[Pollys13]

Should I apply this all around, all the fitting threads that make contact with all the mating part, or just all around one or two? Into the valleys of threads? Got the replacement pipe onto the pot ok and rest of updated assemble. The paint finish held up under the Butane torch, bit hard going at first so gave a good dose of heat, once started, quite easy to get out.
Cheers.

 

[Shox Dr]

To the mating surfaces. You shouldn’t be relying on threads to seal components.

 

[Pollys13]

To the mating surfaces. You shouldn’t be relying on threads to seal components.

I don't quite follow, how do you mean, in practice? Apply on the ridges of the threads, not the hollows?

 

[Shox Dr]

Ok i see what it's for now. Yes, cover the threads. Might not seal, may need ptfe tape. Or hydraulic thread sealant would be better

 

[addjunkie]

To the mating surfaces. You shouldn’t be relying on threads to seal components.

Looking at the last picture, is that a parallel or tapered thread. With a taper thread in particular it is the threads that seal

 

[Shox Dr]

Looking at the last picture, is that a parallel or tapered thread. With a taper thread in particular it is the threads that seal

tape or thread would be better. Liquid PTFE doesn't like big gaps, as it doesn't fully cure. Positional Hydraulic sealant would be better

 

[brightspark]

a bit of paste and ptfe tape good for sealing

 

[addjunkie]

Im a loctite 577 fan. Swak etc is fine, but some you heed to allow time for setting before applying pressure.

 

[Shox Dr]

Im a loctite 577 fan. Swak etc is fine, but some you heed to allow time for setting before applying pressure.

This the grade I would use for that; 542

 

[addjunkie]

This the grade I would use for that; 542
View attachment 209602

That would work, but its not resistant to certain chemical alchols etc, so it depends on the process fluids what you might choose.

 

[Pollys13]

Looking at the last picture, is that a parallel or tapered thread. With a taper thread in particular it is the threads that seal

The replacement pipe is BSPT.

 

[Pollys13]

Thanks everyone else for replies