For reasons, I'm going to put a D lock through the wall of my flat, and I want to protect it against sealing up with rust.
There are coincidentally a pair of perfect holes already in the wall (from old plumbing, I assume?) that I can poke the legs of the D-lock through and then lock from the other side of the wall.
The lock is my current Bike lock, which is used almost daily, is fairly old, and for which the 'teeth' (where the D enters the locking bar) are fairly rusty.
Every 6 months or so, the teeth (and the holes that the go into on the locking bar) get sufficiently rusty that it starts to be a moderate struggle to open the lock if I haven't used the bike for a day or two. At that point I clean it throughly with WD-40 and kitchen towel, to get as much of the rust off as possible and just continue.
This has worked perfectly well for the past 2 years.
Now I want to put the lock through the wall, lock it and leave it in place for years, ideally without ever touching it/having to regularly clean it. The Teeth and locking bar will be on the inside of the wall, the outside point is sheltered and I'll try to block up around the hole to keep rain for passing through, so there won't be any substantial water getting to it ... just general atmospheric humidity (London, UK)
Obviously I'm going to do a heavy-duty clean with WD-40, but I'm wondering whether I should be doing anything more than that to try to protect it?
Some sort of heavier oil, or similar?
Do I need to? What should I be doing? What products/product names should I be looking for? Is there anything I should know about the technique of applying these things?