A watch is an everyday companion, whether you wear it for style, functionality, or both. Many modern watches come with water-resistant ratings, but maintaining this feature over time requires careful attention. Even a watch designed for diving can lose its resistance to moisture if not properly cared for.

Understanding the limitations of your watch and following essential maintenance practices can help protect it from water damage, ensuring it remains reliable for years. This guide explores key tips for keeping your watch water-resistant, from regular servicing to best practices for daily wear.

Understanding Water Resistance in Watches

Many people assume that a water-resistant watch is completely waterproof, but this is a misconception. Over time, the seals that protect your watch from moisture can weaken, and accidental misuse can compromise its resistance.

1. Water Resistance Ratings

A watch’s water resistance is typically indicated by metres (m), atmospheres (ATM), or bars. Here’s a basic guide to what these ratings mean:

Water Resistance Rating

Suitable For

30m (3 ATM)

Resistant to splashes and rain; not suitable for swimming

50m (5 ATM)

Can handle brief water exposure but not prolonged submersion

100m (10 ATM)

Suitable for swimming but not diving

200m (20 ATM) and above

Ideal for diving and high-pressure water activities

It’s important to remember that these ratings are based on laboratory conditions, and real-world factors like temperature changes and ageing seals can reduce a watch’s actual water resistance.

How to Maintain Your Watch’s Water Resistance

1. Keep the Crown Secure at All Times

The crown is one of the most vulnerable points for water ingress.

• If your watch has a screw-down crown, always ensure it is tightly secured before exposing the watch to water.

• Never adjust the time or operate pushers while the watch is underwater, as this can allow moisture to enter the case.

• Regularly check that the crown isn’t loose or damaged, as even a small gap can compromise water resistance.

2. Have Your Watch Tested Regularly

Water resistance isn’t a permanent feature—it degrades over time.

• A watch should be pressure-tested annually, especially if it is frequently exposed to water.

• This test can detect worn-out gaskets, weakened seals, or small case fractures that may allow moisture inside.

• Dive watches or watches worn in water regularly may require more frequent testing.

3. Avoid Extreme Temperature Changes

Sudden changes in temperature can cause materials in your watch to expand and contract, affecting water resistance.

• Never wear your watch in a hot shower, sauna, or steam room, as the heat can expand seals and allow moisture in.

• If you have been wearing your watch in hot weather, avoid immediately plunging it into cold water, as rapid cooling can create negative pressure inside the case.

4. Rinse Your Watch After Swimming

Even if your watch is water-resistant, exposure to salt water, chlorine, or chemicals can cause damage over time.

• After swimming in the sea or a pool, rinse your watch with fresh water to remove salt and chemical residues.

• Dry it thoroughly with a soft cloth and avoid using excessive heat.

• Salt and chlorine can degrade gaskets and metal components, leading to potential leaks.

5. Check the Crystal and Case for Damage

A cracked crystal or a damaged case can completely compromise a watch’s water resistance.

• Inspect the crystal regularly for scratches or small fractures that could allow moisture to seep in.

• If your watch suffers a hard impact or drop, have it checked even if there’s no visible damage.

• Vintage watches are particularly susceptible to case wear, which can affect their ability to keep water out.

6. Ensure Gaskets and Seals Are in Good Condition

Rubber or silicone gaskets and seals play a crucial role in keeping water out of your watch.

• These parts naturally degrade over time, especially with exposure to heat, chemicals, and wear.

• Replacing gaskets during routine servicing ensures that your watch remains properly sealed.

• If you frequently wear your watch in water, have the gaskets checked every 6–12 months.

7. Be Mindful of Soap and Detergents

While your watch may be water-resistant, soaps, shampoos, and detergents can weaken seals and leave residues.

• Avoid wearing your watch in the shower or while washing dishes, as chemicals can break down gaskets over time.

• Soap and lotions can also build up around the crown and pushers, increasing the risk of moisture entering.

8. Don’t Assume All Straps Are Water-Resistant

Even if the watch itself is rated for swimming, its strap may not be.

• Leather straps absorb moisture, which can cause them to weaken, warp, or develop odours.

• Fabric and NATO straps can hold water, leading to faster wear and potential mildew.

• If you plan to wear your watch in water regularly, opt for a rubber strap or metal bracelet, both of which handle moisture better.

9. Store Your Watch in a Dry Environment

Proper storage can help prevent moisture build-up and preserve water resistance.

• Store your watch in a cool, dry place, avoiding direct sunlight or extreme humidity.

• If you live in a humid climate, consider placing silica gel packets in your watch box to absorb excess moisture.

• Avoid leaving your watch in a damp bathroom, as prolonged exposure to humidity can affect gaskets over time.

10. Seek Professional Help if You Notice Condensation

If you notice fogging or condensation inside your watch, this is a sign that moisture has entered the case.

• Do not ignore condensation, as even a small amount of water can damage the movement.

• If caught early, a watchmaker can dry out the movement and replace seals before serious damage occurs.

• In severe cases, internal components may rust, leading to costly repairs or movement replacement.

Final Thoughts

A watch’s water resistance is not something to take for granted. Even with a high water-resistance rating, proper care and maintenance are essential to keep it performing as expected.

By following these key tips—keeping the crown secure, avoiding extreme temperatures, rinsing after swimming, and getting regular servicing—you can significantly extend your watch’s ability to resist moisture and prevent costly water damage.

Whether you wear your watch for everyday use, sports, or diving, taking a few precautions will ensure it remains a reliable and durable timepiece for years to come.