Good lubricant for O rings and threads?

LED Flashlights – General Info
101

These are the O-rings used in Convoy flashlights (which I have plenty of): 21*1.5mm black silicone O-ring for flashlight.

Or these from Kaidomain: 20MM X 17MM X 1.5MM WATER-TIGHT O-RING SEALS - BLACK ( 5 PCS ).

I know the title or description uses “silicone”, but are the black ones actually silicone? They seem like it to me. I have some that have been slightly sliced when I got the Kaidomain hosts since they were not properly lubed.

102

I work it into the grooves with my index finger. Not high tech but you get a lot of control.

103

Thank You everyone for clearing this up for me :smiley: , I have tried several lubes and now I feel comfortable using Super Lube.
I just ordered :
Super Lube 51004 Synthetic Oil with PTFE, High Viscosity, 4 oz Bottle,Translucent white.
I will also get a syringe and needle to apply it with.
:beer:
.