[TowerTalk] Nut & Bolt Sealant

[Gedas]

That is pretty neat Kurt. One of the applications I have requires that 
the agent not be too thin and flow down in between the threads and I 
want it to remain on the outside only.

For example I finished tuning a 6-cavity 10 GHz uW BPF that was so 
amazingly sensitive to the adjustment screws position and contact to the 
case it is hard to explain. Even the slightest change in the electrical 
bonding of the tiny screws and their position changed the filters 
properties drastically. When I finished tuning it to perfection I just 
wanted to put a drop of something over the setting nut and plunger to 
ensure it would not budge a hair. I used thick (semi-hardened) nail 
polish since it was not going to be exposed to the elements. But I will 
also need to seal large nuts and bolts that will be outside as well and 
would be great if there was one product that could be used in both 
applications.

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

On 9/7/2021 11:36 PM, KD7JYK DM09 wrote:
> I used a locktite product that I thought was total BS.
>
> I was installing a brass bodied sensor into a cast aluminum engine head.
>
> I was TOLD there would be a chemical reaction between the brass, 
> aluminum, and locktite.  I expected something like epoxy when cured.
>
> I coated the threads, torqued the sensor, and waited for it to cure.  
> I checked the next morning, the locktite was as wet as ever, and I 
> wiped it off with a paper towel.  I then placed a small heat lamp 
> above the engine, thinking heat would help.
>
> I checked again about ten to twelve hours later, thicker, but still 
> goopy.
>
> Thinking this was a total scam, and I was screwed, I tried to remove 
> the sensor so I could use something else.  Sure enough, the locktite 
> had cured, and was rock-hard, like cured epoxy, in the threads, where 
> the brass, and aluminum came together.
>
> I cleaned everything up, and re-installed, this time waiting the 
> required time, and used solvent to remove the excess goopy locktite.
>
> I never had an issue with the sensor leaking, even when that 
> particular engine over-heated later.
>
> Kurt
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