The choice of the product is made according to the area to be controlled, its difficulty of control and also according to its external environment. (Orientation, accessibility, etc.)
Fluid plastiforms are perfectly waterproof when they have finished curing. Indeed, when the product enters a space, its technical characteristics allow it to flow and occupy the entire space, to the nearest micrometer. When cured, it does not allow anything to pass through it, which makes it easy to create custom-made sealing joints for any type of part.
The F20, thanks to its fluidity and flexibility, is the most recommended product for this type of application since, in addition to being perfectly waterproof, it is very difficult to break it. Be careful, however, that the area to be protected is dry and clean when applying F20.
Also, care should be taken to pour the product slowly and with a tip or needle so as not to create any air bubbles.