Yacht Fender
Maintenance
How to clean, store, inspect, and know when to replace
A good set of yacht fenders should last years. But “should” and “will” depend entirely on how you treat them between dockings. Fenders are one of the few pieces of yacht gear that sit in direct sun, constant salt water, and repeated mechanical compression — all at the same time.
Here’s how to get the maximum life out of your investment.
Cleaning
Fenders get dirty. Marina water, diesel film, algae, salt, and bird droppings accumulate on the surface, and if you don’t clean them off, that residue becomes abrasive grit trapped between the fender and your hull. That grit is what causes most fender-related hull scratches — not the fender itself.
- Rinse with fresh water after every use — or at least weekly if fenders are deployed full-time. Salt residue left to dry becomes abrasive crystals.
- For stubborn dirt, use warm water with a mild boat soap and a soft brush. Work in sections and rinse thoroughly.
- For black marks on white fenders, a specialised fender cleaner or Magic Eraser works well. Apply gently — the surface doesn’t need heavy scrubbing.
- Rinse thoroughly after any soap or cleaner. Detergent residue left on the surface degrades PVC over time.
- For neoprene fender covers: machine wash cold, gentle cycle, air dry. Don’t use bleach or harsh detergents.
- Mild boat soap or dedicated fender cleaner
- Soft brush or cloth
- Fresh water rinse
- Magic Eraser for stubborn black marks
- Acetone or MEK — strip UV inhibitors from PVC
- Strong solvents or bleach
- Abrasive pads or stiff wire brushes
- Pressure washer at close range
If you use neoprene fender covers, the fenders themselves stay significantly cleaner since the cover takes the wear and dirt. Covers can be machine washed, meaning the cleaning job takes minutes rather than an afternoon on the dock. Shop Fender Covers →
Storage
How you store fenders between uses — or over winter — has a bigger impact on their lifespan than most owners realise. The three enemies during storage are UV, heat, and sustained compression.
- Store partially deflated — not fully inflated and not completely flat. About 75% inflation is ideal. This reduces stress on the seams while keeping the fender in shape.
- Store in a cool, dry, shaded location. UV is the number one killer of PVC fenders. A locker, lazarette, or storage bag is far better than leaving them on deck.
- Make sure fenders are dry before stowing in a closed bag. Storing wet fenders in a sealed bag encourages mildew on the surface and inside seams.
- Don’t stack heavy items on top of stored fenders. Sustained compression can permanently deform them — a deformed fender won’t return to its round shape and won’t protect evenly.
Inspection — What to Look For
Check fenders at the start of every season and periodically during use. Most problems are obvious once you know what to look for.
Seasonal Inspection Checklist
Inflate fully and check after 24 hours. Significant softness indicates a valve leak or seam issue. Minor slow loss over 48–72 hours can sometimes be corrected by cleaning and reseating the valve.
UV damage causes PVC to become brittle over time. Light surface crazing is cosmetic. Deep cracks that penetrate below the surface mean the fender is losing structural integrity and should be replaced.
If a fender won’t return to its round shape after inflation, the PVC has been compromised by heat, UV, or sustained compression damage. A deformed fender provides uneven protection and should be replaced.
The inflation valve is the most common failure point. Check that it seals properly and holds air. A leaking valve is often fixable; a cracked or missing valve cap should be replaced immediately.
Healthy PVC is flexible and slightly soft to the touch. Fenders that feel stiff, brittle, or chalky have degraded UV inhibitors. They may still hold air, but their ability to absorb impact is significantly reduced.
When to Replace
There’s no fixed calendar for fender replacement — it depends on usage, UV exposure, and maintenance. But some signs require immediate action regardless of age.
- The fender won’t hold air for more than 48 hours
- There are visible cracks deeper than surface level
- It’s permanently deformed or unevenly shaped after full inflation
- The PVC feels stiff, brittle, or chalky rather than flexible
As a rough guide for expected lifespan under normal conditions:
| Usage & Conditions | Expected Lifespan |
|---|---|
| Year-round, Mediterranean marina, no covers | 2–4 years |
| Year-round, Mediterranean marina, with neoprene covers | 4–7 years |
| Seasonal use, northern climate, well stored | 6–10 years |
| Occasional use, always stored indoors | 8–12 years |
Lifespan figures assume correct inflation, regular cleaning, and no significant impact damage. High-chafe berths or exposed anchorages will reduce these estimates.
Neoprene fender covers are the single most effective thing you can do to extend fender lifespan. They block UV from the fender surface, prevent the direct abrasion that causes surface crazing, and keep the PVC cleaner between uses. If UV damage is why you’re replacing fenders, covers will add several years to the next set — and cost a fraction of replacement.
Protect What You Have
Neoprene fender covers, storage bags, and replacement fenders when the time comes. Everything from Yachtfend.