Gelcoat fillers

Gelcoat putty can be used to repair scratches and thus clean surfaces above the waterline. Epoxy putty is used below the waterline.

Gelcoat fillers group products

Gelcoat Repair Filler 100ml, bright white (2000)
Campaign
Available
16,90 €24,90 €
Gelcoat Repair Filler 100ml, natural white (8012)
Campaign
Available
16,90 €24,90 €
Gelcoat Repair Filler 100ml, grey (off-white) (8008)
Campaign
Available
16,90 €24,90 €
Gelcoat GS3035H 1Kg, ivory white
Available
49,00 €
Gelcoat Repair Filler 100ml, white
Campaign
Available
16,90 €23,00 €
TCnano Gelcoat Sealer 500ml
Campaign
Available
36,40 €53,00 €
TCnano Gelcoat Sealer 250ml
Campaign
Available
25,00 €37,00 €
Gelcoat Repair Filler, white RAL9010
Campaign
Available
16,90 €24,90 €
Gelcoat GS2000H 1kg, white
Available from the supplier
49,00 €
Gelcoat GS3004H 1Kg, bone white
Available from the supplier
49,00 €
Gelcoat GS8008H 1Kg, off white
Available from the supplier
49,00 €
Gelcoat GS8012H 1Kg, natural white
Available
49,00 €
Gelcoat GS9000H 1Kg, black
Out of stock
49,00 €
Gelcoat Repair Filler 100ml, grey-white
Campaign
Available
16,90 €24,90 €
Gelcoat Repair Filler 100ml, Uttern white
Campaign
Available
16,90 €24,90 €
Gelcoat Repair Filler 100ml, bone white
Campaign
Available
16,90 €24,90 €
Gelcoat Repair Filler 100ml, natural white
Campaign
Available
16,90 €24,90 €
Gelcoat Repair Filler 100ml, J3004 bone white
Campaign
Available from the supplier
16,90 €24,90 €
Gelcoat Repair Filler 100ml, J3008 sail white
Campaign
Available from the supplier
16,90 €24,90 €
Gelcoat Repair Filler 100ml, J3009 dark yellow
Campaign
Available
16,90 €22,90 €

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Gelcoat repair materials and accessories

Gelcoat protects the hull of your boat and gives it a shiny, finished look. However, cracks, scratches and fading can ruin your boat's appearance and reduce the protective properties of the surface. Fortunately, gelcoat repair can restore the surface to its former glory!

Careful preparation, high-quality gelcoat filler and careful finishing ensure a successful outcome. Protect your boat's hull from water damage and UV-induced embrittlement with gelcoat repair. Discover our selection!

What is boat gelcoat?

Gelcoat is a protective and finishing layer applied to the surface of a boat, which is applied over a laminated fiberglass structure. Gelcoat is made of a resin-based material containing pigments, and it creates a hard, shiny and smooth surface.

Gelcoat protects the boat's hull:

  1. UV radiation: Prevents material embrittlement and discoloration caused by sunlight.

  2. Against water damage: Makes the surface water-resistant and prevents moisture from penetrating into structures.

  3. Wear and tear: Protects against scratches, impacts and other mechanical damage.

  4. From chemicals: Reduces damage caused by fuels, oils and other substances used in boating.

How can a boat's gelcoat be damaged?

Gelcoat is not completely immune to damage. Years of use, environmental conditions and mechanical stress can cause various types of damage to the gelcoat. Preventing damage and timely gelcoat repair are important to maintain the longevity and appearance of the boat.

Common types of gelcoat damage and their causes

1. Cracks and fissures
  • What causes them?

    • Mechanical stress, such as impacts or vibrations on the boat's hull.

    • Thermal expansion and contraction of a material due to temperature fluctuations.

    • Structural deformation of the boat, for example in heavy waves.

  • What do they look like?

    • Cracks can be small hairline cracks or larger, deeper cracks. They typically occur in stressed areas of the boat, such as at the mooring points, deck and hull interfaces.

2. Scratches and dents
  • What causes them?

    • Rubbing against mooring lines, docks or other boats.

    • Objects, such as anchors or tools, hitting the surface of the boat.

  • What do they look like?

    • Scratches can be superficial or deeper, exposing the fiberglass structure beneath the gelcoat.

3. Fading and discoloration
  • What causes them?

    • Long-term exposure to the sun's UV radiation, which breaks down the pigments and protective agents in the gelcoat.

    • Lime or salt deposits on the surface caused by water and humidity.

    • Exposure to chemicals, such as fuels or harsh cleaning agents.

  • What do they look like?

    • The surface will lose its shine, and colors may become uneven or fade.

4. Osmotic damage
  • What causes them?

    • Prolonged exposure to water can cause moisture to penetrate through the gelcoat into the fiberglass structure.

    • The chemical reaction between water and resin forms acids that can swell and weaken structures.

  • What do they look like?

    • Small blisters or bumps containing fluid may form on the surface.

5. Gelcoat peeling or chipping
  • What causes them?

    • Incorrect repair or poorly applied gelcoat in the first place.

    • A hard impact or weight load that damages the bond between the gelcoat and the fiberglass structure.

    • Continuous vibration or load during boat operation.

  • What does it look like?

    • The gelcoat will chip away, exposing the fiberglass surface, exposing it to further damage.

6. Waterlines and fouling
  • What causes them?

    • Prolonged exposure to water, especially stagnant or salt water.

    • The attachment of marine organisms, such as algae or mussels, to the surface.

  • What do they look like?

    • Dark or greenish lines and patches, especially at the waterline.

Is gelcoat repair profitable?

Gelcoat repair is usually a good idea because it helps maintain the boat's appearance, surface protection, and resale value. Gelcoat repair is especially beneficial if:

  • There are cracks or scratches on the surface: Small damages can lead to bigger problems, such as water penetration into structures.

  • Gelcoat has faded: Renewal restores the surface's shine and color.

  • Cracks are cosmetic: They can be repaired fairly easily and cost-effectively.

If the damage extends deep into the fiberglass, simply repairing the gelcoat is not enough, and structural repair is necessary.

What is gelcoat filler or gelcoat putty ?

Gelcoat filler or gelcoat putty is a resin-based repair material used to repair scratches, cracks, and other damage to gelcoat. It often contains fillers that make it easy to apply and self-cure.

Gelcoat filler can be used to:

  1. Fills minor damage: Scratches, dents and cracks.

  2. Restores surface protection: Prevents water penetration and protects structures.

  3. Maintains aesthetics: A good quality gelcoat filler can be tinted to match the boat's original color.

How is gelcoat repair done?

Gelcoat repair is often possible to do yourself, but for larger repairs it is recommended to use a professional. The gelcoat repair process proceeds as follows:

1. Gelcoat Repair: Surface Preparation

  • Clean the area thoroughly with soapy water and dry.

  • Remove any loose gelcoat and sand the damaged area smooth using sandpaper (e.g. 240-400 grit). This will ensure the new gelcoat adheres.

2. Gelcoat Repair: Material Preparation

  • Choose a gelcoat filler or other gelcoat repair product that matches the original color of the boat. If necessary, you can mix pigments to achieve the right shade.

  • Mix the gelcoat repair agent according to the manufacturer's instructions, often adding a catalyst.

3. Gelcoat repair: Application of gelcoat filler

  • Apply gelcoat filler or other gelcoat repair material to the damaged area using a spatula or application tool. Fill the damage evenly.

  • Allow the gelcoat filler to cure. Curing may take several hours, depending on the product used and the ambient temperature.

4. Gelcoat repair: Sanding and polishing

  • Once the substance has dried, sand the surface smooth using fine sandpaper (e.g. 800–1200 grit).

  • Finally, polish the area with a polish to blend it in with the rest of the surface and restore the shine.

Gelcoat repair materials and accessories from Marinekauppa

Gelcoat repair is always a good idea, as small damages can lead to bigger problems. Gelcoat repair is done by cleaning, filling and finishing the damaged area. Gelcoat filler or putty is a handy substance that can easily repair small dents and scratches. Gelcoat filler easily restores the appearance and protection of the surface, making it an essential product for boat maintenance.

Check out our selection and order!

Fast delivery
For products in stock, 1-3 workingdays. For ordering products, 2-7 days.
Customer service
010 548 5605 (days 9-18) asiakaspalvelu@marinekauppa.com
14-day right of return
Products have a 14-day free return right. All products have a minimum 6 month warranty.
Pay securely
Secure online payments. Pay with online banking, credit card, invoice or partial payment.

CONTACT INFORMATION

Our customer service is available on weekdays 9-17. email: asiakaspalvelu@marinekauppa.com

STORES

HELSINKI
Veneentekijäntie 3
00210 Helsinki (Lauttasaari)
FINLAND
mon–fri 9–18
sat 9-15
sun closed

VANTAA
Porttisuontie 13
00120 Vantaa (Porttipuisto)
FINLAND
mon–fri 10-18
sat 10-15
sun closed

COMPANY INFORMATION

Marinekauppa.com / Norcap Oy Ab
Company ID 1827467-5
Founded in 2003
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