I want to set my potentiometer screws and then glue them in place so they will not be readjusted by the end user and I have seen green adhesive on them before? Any suggestions as to what is best to use on this type of application? Thank you.
Loctite is often used. However there are many types. In general you hear people talk about blue, green and red (242, 290, and 271). Blue prevents inadvertent movement due to vibration and such. With moderate force the pot could be turned. Green is stronger, usually you need to apply a little heat before it can be turned. Red requires a lot of heat and would probably destroy the pot.
On trimpots I use automotive touch-up paint, available inexpensively in a variety of colors, and it comes with an appropriate applicator brush.
I'm really not worried about the pot moving by itself in most cases, I'm more concerned with detecting some dufus fiddling with the calibration settings (often to make up for something external that is wrong, such as a bad sensor or improper compensation).
In the instrument business we refer to such a change in calibration as "screwdriver drift". Have a unique color helps ensure that the fiddling can be reliably detected.
If you want something temporary, hot glue is fine.
If you want something permanent, the canonical brand name for threadlocking compounds is Loctite. Not sure which Loctite compound to recommend -- they're usually not cheap ($40-$50 per 50ml bottle), but they're designed to retain mechanical screws despite vibration & temperature cycling. For a potentiometer, you could probably get away with general-purpose cyanoacrylate (aka Superglue sold in most stores).
Something to be aware of though: Whatever you use, make sure it's not corrosive. From Murata's website:
Can the rotor and adjustment shaft be thread-locked after adjustment?
The only products which can be thread-locked are hermetically sealed products whose wiper and resistive element are not exposed.
Use thread-locking adhesive which does not contain substances that can corrode metals, such as chlorine and sulfur. When using thread-locking adhesive, carefully evaluate its performance on an actual potentiometer.
Don't use loctite! I purchased an amplifier with red loctite on a tiny pot with no sealing. This pot was to adjust bias, so I needed to move it when I changed power tubes. I managed to get the pot moving without breaking it by securing the body with pliers while I turned the moving part. Unfortunately, that loctite went right into the pot conductive area, and screwed up the pot completely over one half of its range. I can no longer use that range on the pot.
This is just one example, but there is more information available from the manufacturers of potentiometers and adhesives.
One solution is a good quality pot that does not turn easily by itself. Or you can use a pot with a smaller range in series with a fixed resistor, if you are worried about users choosing a bad range.
Another option is to use a sealant specifically designed for potentiometers. "Red" Locktite, and other commonly available sealants known by the name "Locktite", is for wicking into mechanical threads. However, the name "Locktite" is a brand name and not a specific product. The same company produces many types of adhesives, some of which are appropriate. According to the manufacturer, the product Locktite 425 is appropriate for sealing potentiometers.
A thicker product probably has less potential for damage. According to Murata, a trimmer potentiometer manufacturer, "The only products which can be thread-locked are hermetically sealed products whose wiper and resistive element are not exposed.."