You can use THIS Contralube to smear over electrical connections, GREAT for Battery connections etc Buuuuttt-When I marinise
I remove ALL connectors, ("marine" or not) and connect the wires with heat shrink wrap glued crimped butt connectors.
Ive checked MY 6 year old connectors, by grinding away to a cross section and found they were as good as NEW--- after 6 years salt spray.
The test could not have been harder--- The results could not have been better. THIS is one reason why I am so KEEN on this kind of marinisation.
With respect to "connectors" they are MEANT (designed) to come apart. IMHO there is NO real reason to have that facility. Connectors are used PURELY to allow first constructors of cars/boats/ hovercraft / engines / bilge pumps to EASILY assemble. With practice, I can create a perfect non time/salt dependant electrically superb connection in 20 secs perhaps. Job done, no worry - NO failure - No sweat. Just 20 secs to assure such reliability is "a no brainer"! IMHO!
WHEN you remove the engine- CUT the wires! When replacing engine, clean last 3 inches with Iso Prop Alc - strip the wire back and "BUTTS" your uncle.