By the way, I've had good results with Harbor Freight heat shrink connectors. They have the glue in them also, and make a perfect seal.
Additionally, remember that liquid electrical tape is your best friend. As the name implies it's a non-conducting liquid that you can brush on any electrical connection. After it dries you have a 100% complete air and water tight seal. I pretty much use it for any connection I have to make, including covering the spade terminals where they go into the buss box.
Remember, you're not only trying to keep out any water, but also any air. Salt air is just as corrosive as salt water. It just takes a little longer, but the result is the same. So make those connections as airtight as possible.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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