I just installed a new Coolant Temp Sensor, and used permatex high temp thread sealant.

It says 4 hours you can adjust it, and 72 for full cure.

How Long should I wait to drive it? 4 hours? Or will it cure regardless of use?

 

Sensor/manifold should have tapered pipe threads designed to prevent leaks. Sealant is primarily used to prevent seeps in pipe thread applications. You should be fine after several minutes and more than good to go after waiting the 4 hour adjustment period. Adjustment period is given because if it's hardened/cured too much and moved it might break the seal. Waiting for the full cure would be advisable if you noticed sloppy thread fit during install.
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I use that sealant all the time and technically it needs to cure for 24 hours before you pressurize.

But in this case it doesn't matter because the coolant temp sensor, either MEK100160 or MEK500130
has an aluminum washer to make the seal. The threads are M12-1.5

 

 

You're right RAVE mentions both the sealant and the washer. And that's how I do it too (not 577, but the high temp Permatex).
From your 1st post IDK if you were using only the sealant and not the washer.
It's the washer that's really making 100% of the seal.

 

 

OverRover,
Thanks very good to know information. Assumed threads would be tapered for the hot coolant application and didn't know what the heck I was writing about thread wise. The LR engineers saw some benefits of doing away with many/most tapered pipe threads and using a sealing washer. Should we safely assume if a crush washer or o-ring is shown in the parts diagram the threads are straight?
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It's been my experience that's a good base to start from, but I always check/inspect threads just to be sure.

I have not seen a NPT thread ever seal with a washer. I'm not saying it doesn't exist, but I have not come across the application for it. Just by the design NPT or BSPT threads seal because of the taper, and helped along with the use of sealant/pipe dope or tape.
That being said I still use a very small amount of sealant on straight threads just as a lubricant.
Right or wrong and maybe overkill, but it's just habit.

I like this stuff > https://www.permatex.com/products/th...hread-sealant/