Why grease a watch gasket
Silicone grease is the reference sealing agent in watchmaking. It is water-repellent, keeps the gasket supple and prevents hardening. A properly greased gasket delivers longer, more reliable water resistance after reassembly.
This applies to case gaskets and crown gaskets. Crystal gaskets, on the other hand, should not be greased.
Quick method: the lubricating box
The lubricating box uses sponges impregnated with silicone grease, applying it evenly without overdosing.
- Place the gasket between the two sponges.
- Close the lid and turn it half a revolution.
- Lift the gasket out with tweezers: it is evenly greased.
- Seat the gasket in its groove without contaminating it.
Manual method
If no box is available, apply the grease with a spatula or a clean finger:
- Pick up a tiny amount of silicone grease.
- Roll the gasket between thumb and forefinger coated with a thin film.
- Avoid excess: any surplus traps dust and debris.
Required tools
- Watchmaking-grade silicone grease
- Lubricating box (recommended)
- Watchmaker tweezers
Available in our watchmaking tools section.
Without silicone grease, even the best gasket loses half of its useful life.
Lubricant comparison
| Type | Use | Service life |
|---|---|---|
| Watchmaking silicone grease | Case & crown O-rings | 2 to 3 years |
| Mineral grease | Never on elastomers | Attacks the gasket |
| Watch oil | Movement only, never on gaskets | — |
Common mistakes to avoid
- Applying a mineral grease that attacks the elastomer
- Overdosing the grease: dust sticks to it
- Greasing a crystal gasket (never do that)
FAQ
Which grease should I use?
Only watchmaking silicone grease. Mineral greases attack elastomers.
How often should I re-grease?
Every time you open the case, or every 2 years as preventive servicing.
Can I grease a gasket already fitted?
Ideally not. Remove the gasket, grease it, then refit it for an even coating.