Everybody who lives near the sea has been told that salt air is hard on locks, and it is. But on the Elche coast that is only half of what is happening, and the other half is the one that actually seizes cylinders.
Two different attackers
Elche has six beaches and more than nine kilometres of sand. El Carabassí, between Arenales del Sol and the airport, is a genuine dune system: high dunes, fossil dunes and pine woodland. El Pinet runs nearly two kilometres over a dune belt. Arenales itself is almost three kilometres of it. The housing is not near the sand; it is against it.
Salt is a chemical problem. It corrodes, slowly and evenly, and it announces itself — you can see it on the handle and the hinges long before the key complains.
Sand is a mechanical one. Fine grains blow in, work down into the keyway, and then sit between moving parts that were machined to fractions of a millimetre. Every turn of the key grinds them against the pins. It shows up as a lock that is not corroded at all, that looks perfectly healthy, and that has been quietly wearing itself out from the inside.
How it actually presents
Not as a failure. As a sequence:
- The key needs a small lift or a jiggle. You learn the knack without noticing.
- The knack stops working from outside but still works from inside, or vice versa.
- One day the key goes in, turns halfway, and stops.
- You apply the force that has worked every other time, and the key snaps.
The whole thing takes eighteen months and looks like bad luck on the last day.
The two things that make it worse
Do not use oil. This is the single most common own goal on this coast. Oil in a cylinder that has sand in it makes a grinding paste, holds it against the pins, and attracts more. A lock somebody has generously oiled every spring is usually worse than one nobody has touched.
Do not force a key that has started resisting. Extracting a snapped key from a worn cylinder costs several times what replacing the cylinder would have cost the week before.
What does help
A dry lubricant — graphite or a PTFE-based product — rather than a wet one. Whoever holds the key for you turning it in both directions a few times when they check the property, so the mechanism is not sitting motionless for eight months. And realistically, accepting that on a beachfront door a cylinder is a wearing part with a life, not a fitting that lasts as long as the building.
The useful test is not whether it works. It is whether it works the same way it did last year.
If this is where you have got to, the page you want next is a new cylinder.