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RTV:
RTV Silicone - Automotive Adhesive, the colors we used at work were clear, white and red and blue
Our maint. crew used it for sealing gaskets, etc
Outside the plant at home projects we used it to put on slippery knife handles for better grip and used for when adding depth finder transducers. Put on the screws for a water tight fit. GE makes it, Pematex I believe also. I used some clear approx two days ago when I installed my dept finder and GPS. I used it to seal around the holes I cut for those two items.
Some old folks use GE 4300, GE 4200, but that is for permanent use.