Few towns put their locks through as much as Calpe. The centre sits between two beaches and around Las Salinas, a salt lagoon of about 41 hectares inside the town itself, a protected wetland where flamingos gather for part of the year. Add the sea breeze and summer humidity, and every lock on a terrace, a gate or a seafront door is breathing salt.
That does not mean every lock fails. It means they fail in a particular way, and there is a lot you can do to slow it down.
What salt does inside a cylinder
A euro cylinder is a row of small brass and steel pins held by springs. Your key lifts each pin to exactly the right height so the plug can turn. Three things go wrong near the sea:
- Salt crystals form when damp air dries inside the keyway. They add friction and stop pins dropping cleanly.
- Corrosion attacks the springs and the steel parts, so pins stick in the wrong position.
- Old grease turns into a paste with the salt and sand it has trapped, which is worse than no lubricant at all.
The result is the familiar Calpe routine: the key goes in fine, then needs a wiggle, then a pull, then one day it will not turn at all.
Early signs
- You have to jiggle the key or pull it slightly out to turn it.
- The key comes out with a grey or greenish residue.
- There is white powder or green staining around the keyway.
- The lock works in winter mornings but not on a hot afternoon, or the other way round.
At this stage the lock can almost always be saved.
What helps
Use a dry lubricant made for locks. A PTFE (Teflon) or graphite-based lock spray, one short burst into the keyway, then work the key in and out a few times. Once or twice a year is enough for most doors; every few months for a terrace gate facing the sea.
Rinse the outside, not the inside. Wiping salt off handles, escutcheons and gate locks with fresh water keeps corrosion from creeping into the mechanism.
Keep sand out of sliders. On aluminium terrace doors the lock is rarely the first thing to go: the rollers and the track fill with sand and salt, the door drops, and the lock no longer meets its keep. Vacuum the track regularly in summer. More on that on the uPVC and aluminium doors page.
What not to use
- Cooking oil, WD-40 as a lubricant, or heavy grease. They work for a week, then catch every grain of sand and salt that passes.
- Glue or lighter heat on a frozen key. Both are common suggestions online and both destroy cylinders.
- Force. A key that is bent turning a seized lock is how most snapped keys happen.
When cleaning is no longer enough
If the pins themselves have corroded, no spray will bring them back for long. The honest answer is a new cylinder, and it is worth choosing one with good corrosion resistance: nickel-plated or stainless finishes last far longer near the sea than bare brass.
If the house is left empty for months, the problem is worse: nobody works the lock, so it seizes in place. Before a long absence, see the checklist for closing up a Calpe home.
For cylinder replacement, anti-snap upgrades and the options for a seafront door, see lock replacement in Calpe.