J-B Weld MarineWeld™ Epoxy Syringe 25ml – Waterproof Marine Repair Adhesive

J-B Weld MarineWeld™ Epoxy Syringe 25ml is a high-strength, two-part Cold-Weld™ marine epoxy adhesive designed for strong, long-lasting repairs on metal, composites, fibreglass and other suitable materials. Specially formulated for marine and water-exposed applications, it provides a durable 3,200 PSI bond and can be used above or below the water's surface once fully cured.

Ideal for bonding similar or dissimilar materials, MarineWeld™ provides a versatile solution for boat repairs, marine equipment, fibreglass repairs and other applications where resistance to water and demanding environmental conditions is important.

Once cured, J-B Weld MarineWeld™ is resistant to water, chemicals and UV exposure. Its ability to maintain full strength above or below the water's surface makes it particularly useful for repairs to components that may be regularly exposed to water or submerged during normal use.

MarineWeld™ has an approximate 20-minute set time and reaches full cure in approximately 15–24 hours. Once completely cured, the hardened epoxy can be shaped, tapped, filed, sanded and drilled, allowing the repaired area to be finished or modified as required.

The epoxy cures to a white finish, which can be useful for marine, fibreglass and other applications where a lighter-coloured repair is preferred.

For anyone looking for a waterproof marine epoxy, fibreglass repair adhesive, boat repair epoxy or epoxy suitable for underwater service after curing, J-B Weld MarineWeld™ provides a strong and versatile repair solution.

Key Benefits

• High-strength two-part marine epoxy adhesive

• J-B Weld Cold-Weld™ adhesive technology

• Strong 3,200 PSI bonding strength

• Designed for marine and water-exposed applications

• Suitable for bonding similar and dissimilar materials

• Bonds suitable metals

• Ideal for fibreglass repairs

• Suitable for compatible composite materials

• Water resistant once cured

• Chemical resistant

• UV resistant

• Suitable for underwater applications once fully cured

• Retains full strength above or below the water's surface

• Sets in approximately 20 minutes

• Fully cures in approximately 15–24 hours

• Can be shaped after full cure

• Can be tapped and filed

• Can be sanded for finishing

• Can be drilled after curing

• Cures to a white finish

• Convenient 25ml syringe

How to Use

• Ensure the surfaces being repaired are clean and free from dirt, grease, oil and loose material that could affect adhesion.

• Prepare the bonding surfaces as required to provide a suitable key for the epoxy.

• Dispense the required amount of both epoxy components from the syringe.

• Mix the two components thoroughly according to the manufacturer's instructions.

• Apply the mixed MarineWeld™ epoxy to the repair or bonding area.

• Bring the components together and position them correctly before the epoxy begins to set.

• Secure or support the components where necessary while the initial bond develops.

• Allow approximately 20 minutes for the epoxy to set.

• Allow approximately 15–24 hours for full cure.

• For underwater service, allow the product to fully cure before exposing the repaired component to underwater conditions.

• Once fully cured, the epoxy can be shaped, tapped, filed, sanded or drilled as required.

• Always follow the manufacturer's application and safety instructions supplied with the product.

Suitable Materials & Applications

• Metal

• Fibreglass

• Compatible composites

• Marine repairs

• Boat repairs

• Fibreglass boat components

• Marine equipment

• Water-exposed components

• Above-water repairs

• Underwater service after full cure

• General waterproof repair applications

• Multi-material bonding

• Workshop and maintenance repairs

Product Information

Brand: J-B Weld
Product: MarineWeld™ Epoxy Syringe
Size: 25ml
Type: Two-part Cold-Weld™ marine epoxy adhesive
Bonding Strength: 3,200 PSI
Set Time: Approximately 20 minutes
Full Cure: Approximately 15–24 hours
Colour When Dry: White
Water Resistant: Yes
Chemical Resistant: Yes
UV Resistant: Yes
Underwater Use: Yes, once fully cured
Suitable Materials: Metal, fibreglass, composites & other compatible surfaces
After Curing: Can be shaped, tapped, filed, sanded & drilled
Primary Use: Marine, waterproof & water-exposed repairs

WEEE Recycling Producer Registration Number:12889

How do I return my old product to be recycled?

You can return your old product to MyDIY. Waste Electrical and Electronic Equipment (WEEE) is taken back free of charge on a one-for-one, like-for-like basis. Waste batteries including rechargeable batteries are taken back free of charge. You are not obliged to make any purchase when returning old batteries. Each local authority must also accept household WEEE and small batteries free of charge at its recycling facilities. All WEEE and waste batteries must be recycled and should not be placed in any of your household wheelie bins. Make sure you always recycle all your old electrical goods and batteries.

What products can I recycle for free?

You can return anything that is electricaly powered or battery powered. Even your old bicycle lamps can be recycled!.

Do you take back used batteries?

Yes we do. The batteries that we accept are AA, AAA, C or D, powertool batterys and also the flat batteries that are found in watches and toys. Unfortunately we do not accept back any Industrial or car batteries.

Do I need to have made a purchase at MyDIY.ie?

No you don't. You can recycle any of the above items at our store in Inchicore Dublin 8, even if you have not made a purchase with us.

Will you collect my old product?

Yes, but we must be notafied within 14 days of purchase date. You can still arrange to have your old appliance recycled free of charge. Simply bring it back to our Inchicore store and we will ensure that it is disposed of in an environmentally friendly manner.

How much will it cost?

There is no charge to return products to any of our warehouses.

Why should I recycle with MyDIY?

We will ensure that your old product is disposed of correctly to reduce the potentially harmful effects caused on the environment and to conserve natural resources. Further information can be found on weeeireland.ie.

EMC (Environmental Management Cost) Included in the purchase price. 

Gas discharge lamps, LFLs and CFLs €0.15

LED lamps and luminaires €0.05

Large appliances €5.00

Information

Fast & Reliable Shipping with DPD

We ship all orders via DPD, one of Ireland’s most trusted couriers. With DPD’s one-hour delivery window, you won’t have to wait around all day for your MyDIY.ie order!

Delivery Times

Each product on our website is marked with an estimated delivery time. If you order multiple items, your order will arrive based on the item with the longest delivery time. For example, if you buy two next-day items and one 3-day item, the entire order will arrive in 3 days.

While most products arrive in 1-2 days, we offer over 44,000 items, so please allow 4-5 working days for some deliveries. Need it faster? Call us at 01-446692, and we'll do our best to help.

Delivery Charges

• FREE delivery for orders over €150 within Ireland.

• Orders under €150: €8.99 delivery fee.

• International delivery: Charges based on weight—contact us for a quote.

When Will I Receive My Order?

• Most orders ship on a 24-hour courier service (2 working days).

• Larger orders may take 4-5 days, and pallet deliveries require scheduling.

• Orders placed before 2 PM usually ship within 24 hours.

• Orders after 1:30 PM Friday or on weekends ship the following week.

• Busy holiday periods may cause slight delays beyond our control.

Do I Need to Be Home for Delivery?

Yes, someone must sign for deliveries due to item value. If you're not home, DPD will leave a card with re-delivery or collection instructions. After two failed attempts, your order may be returned to us, and a re-delivery fee may apply.

Damaged or Incomplete Orders

We carefully pack all orders, but if something arrives damaged or incomplete, contact us within 24 hours. Report shortages within 3 days of delivery.

International Shipping

We ship to Europe and worldwide, with charges based on weight. Liquid products cannot be shipped internationally due to regulations. Contact us for a quote—we're happy to help!

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