The Right Way to Lubricate a Door Lock (and the One Product That Will Ruin It!)

The Sticky Lock Problem

Is your key getting stiff? Does your lock stick when you try to open it? Don't wait until the key snaps off! A little lubrication can fix a stiff lock instantly, but using the wrong product can turn a small problem into a very costly repair. As Dublin’s locksmith experts, here is our quick guide on how to treat your locks right.

The Locksmith’s Golden Rule: Avoid Oil-Based Lubricants

Most people instinctively reach for the nearest can of spray lubricant when a lock sticks. This is the number one mistake!

• AVOID: WD-40, general-purpose machine oil, or cooking oil.
• Why? These products are petroleum-based. While they provide temporary relief, they are "wet" lubricants. Over time, they attract and bind fine dust, dirt, and metallic particles worn off the lock pins. This creates a thick, sticky sludge inside the precision mechanism, jamming the lock far worse than before.

The Best Lubricant for Any Lock

When lubricating a lock cylinder, you must use a dry lubricant.

• USE: Graphite Powder or a specialised PTFE-Based Lock Spray.

1. Graphite Powder (The Traditional Choice)

• What it is: A fine, black, powdered carbon. It’s completely dry, slick, and naturally anti-static, meaning it won't attract dirt.
• How to Apply: Puff a small amount of the powder directly into the keyway (the hole where the key goes). Work the key in and out several times to spread the graphite around the pins and levers. Be warned: it can make a mess on light-coloured doors!

2. PTFE-Based Lock Spray (The Modern Solution)

• What it is: A spray containing Polytetrafluoroethylene (PTFE), often marketed as “Dry Lock Lubricant” or “Lock Cleaner Spray.” It goes on wet to flush out dirt, but the carrier solvent quickly evaporates, leaving behind only the dry PTFE film.
• How to Apply: Spray a small squirt directly into the keyway and into the latch/bolt mechanism on the side of the door. Wipe up any excess immediately.

Don't Forget the Bolt and Latch!

Many people only treat the keyhole, but the latch and bolt (the parts that actually move in and out of the door frame) also need attention.

• The Moving Parts: The deadbolt, the latch, and the faceplate mechanism on the edge of the door can all seize up.
• The Right Product Here: For these external moving parts, you can use a high-quality silicone spray or the same PTFE spray. Silicone spray is excellent because it repels moisture and won't attract dust as much as thick oil, keeping the door smooth and quiet.
• Application: Spray a small amount directly onto the bolt and into the strike plate opening on the door frame. Work the door handle and turn the key a few times to spread the lubricant.

A well-maintained lock is a reliable lock. If you've already used the wrong product and your lock is now sluggish or seizing up, you need a professional clean or a replacement. Don't risk a costly lockout!

Call Dialock Locksmiths today for expert lock maintenance and repairs.