Water prevention for gun lock

[Xenon]

I searched high and low for a combination cable gun lock to use as a lightweight lock for my fence gate. It's an iron fence and the lock in the self contained knob and latch which may or may not work, but since I do not have a key, I went this route. I also need to have my son afforded access to it without carrying a key.

With that said... Since this lock is not designed for outdoor use, I would like opinions of what to do to protect the lock from weather without compromising utility.

I have some Super Lube Synthetic Grease with Syncolon, typically used for rubber gaskets in water applications. I predict using it like packing a bearing, pressing it into all of the holes and crevices. I also have gun oils and such.

What will provide me with the best coverage without greasing up my hands every time I/son use the lock?

Lock looks like this

 

[JBP55]

I have gate locks that have been in use outdoors for more than 20 years and I use a quality lubricant on them about 2-3 times a year. I normally use the same thing I use on my guns which is Mobil 1. It is in a bottle with a needle tip and easy to use. It has many uses around the house, automobile and guns. If you find the oil too thick mix 3 parts oil with 1 part Dextron ATF. Any good lubricant should work.

 

[Xenon]

You put it into a bottle with a needle tip or you bought it that way?