If you own a boat, chances are you've experienced dock rash โ or you will. It's the scuffing, scratching, and gelcoat damage that happens when your hull makes contact with a dock, jetty, pylon, or wharf. It happens during berthing, while moored in a swell, or simply through the boat moving against the dock overnight.
The frustrating part? It's completely preventable.
What Exactly is Dock Rash?
Dock rash refers to surface damage on a boat's hull caused by contact with a hard dock structure. It typically appears as:
- Fine scratches and swirl marks on fibreglass gelcoat
- Deep gouges from timber pylons or concrete edges
- Black marks from rubber dock edging
- Paint transfer from painted dock surfaces
- Stress cracks in severe cases
Gelcoat is the outer protective layer of a fibreglass boat โ once it's scratched through, moisture can penetrate into the fibreglass laminate, leading to osmotic blistering and structural issues over time.
How Much Does Dock Rash Cost to Repair?
Minor gelcoat scratches can cost $300โ800 to professionally repair. Deeper damage requiring fibreglass work can run $1,500โ5,000+. For a new boat, even minor dock rash can significantly impact resale value. The cost of prevention with a quality dock fender system is a fraction of a single repair bill.
What Causes Dock Rash?
The main causes of dock rash are:
- Berthing impact: The boat making contact with the dock while coming in
- Wind and tide movement: The boat swinging against the dock while moored
- Swell: Harbour or marina swell pushing the boat repeatedly against dock structures
- Inadequate fender coverage: Using the wrong fender type, size, or placement
The Problem with Inflatable Fenders
Most boat owners use inflatable fenders hung over the side of the boat. The problem is that inflatable fenders need to be deployed before every berthing, positioned correctly, and stowed afterwards. In practice, this means:
- Fenders get forgotten and left hanging while underway
- They shift position during contact and don't cover the right spot
- They deflate over time and provide reduced protection
- They perish in UV and saltwater environments
- They need to be replaced regularly
A fixed dock fender system eliminates all of these problems.
The Best Way to Prevent Dock Rash
The most effective dock rash prevention is a permanently mounted dock fender system using high-density EVA foam. Unlike inflatable fenders, a fixed EVA foam fender system:
- Is always in position โ no setup required before berthing
- Covers the exact contact zone specific to your vessel and berth
- Never deflates or shifts during contact
- Requires zero ongoing maintenance
- Lasts for years in UV and saltwater conditions
How DockGuard Works
DockGuard EVA dock fenders are mounted permanently to your dock using the built-in rope-through channels. Once installed, they sit in the exact position your hull contacts the dock โ every time, automatically.
The high-density EVA foam absorbs berthing impact and prevents direct hull-to-dock contact, eliminating dock rash entirely at the protected contact points.
DockGuard fenders are non-marking โ they will not transfer colour or residue to your gelcoat. They're UV stabilised for Australian conditions and completely saltwater resistant.
How Many Fenders Do You Need?
For most boats and jet skis, 2 fenders cover the primary contact points. Larger vessels or those with longer berth contact zones may need 4โ8 fenders for complete coverage. As a general guide:
- Jet ski / PWC: 2 fenders
- Boat up to 6m: 2โ4 fenders
- Boat 6mโ10m: 4โ6 fenders
- Boat 10m+: 6โ8 fenders
Protect Your Hull Before It's Too Late
Dock rash is one of those boat problems that's easy to ignore until it becomes expensive. A quality dock fender system is one of the highest-value upgrades you can make to your berth setup โ protecting an asset worth tens or hundreds of thousands of dollars for a fraction of the cost of a single repair.