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Antifouling For Boats

Antifouling paint is designed for use below the waterline on the hull of your boat, preventing any organisms from growing on the hull.

Eroding antifoul, such as International Boatguard EU or Hempel Classic Antifouling, gently breaks down, releasing biocides as it does so and preventing any marine life from anchoring to the hull.

Hard antifouling, such as International Trilux 33 is more often used by performance boats as well as on stern gear and can sustain higher speeds than eroding antifoul.


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10 Item(s)

  1. International Boatguard 100 Antifoul 2.5L

    Great value polishing antifoul, suitable for fresh or salt water and ideal for river cruisers.

    Starting at: £62.50
  2. International Cruiser Bright White Antifoul 2.5L

    A general purpose cruising antifoul designed for boat owners who require a bright white hull with antifouling protection.
  3. International Trilux 33 375ml

    Trilux 33 Antifoul is a high performance, hard antifouling ideal for use on stern gear, outdrives and as a boottop.

    Starting at: £24.00
  4. International Trilux Prop-O-Drev Antifouling 500ml

    International Trilux Prop-O-Drev is an aerosol spray antifouling specially formulated for aluminium and stainless steel outdrives, outboard legs, propellers and sterngear.

    Starting at: £28.65
  5. International Primocon Underwater Primer

    Primocon is a conventional one part primer for use below the waterline, available in 750ml or 2.5l.

    Starting at: £21.00
  6. International Interprotect Primer 750ml

    Quick drying, easy to apply, two part epoxy primer for high performance protection.
    Starting at: £28.95
  7. International Interprotect Primer 2.5L (Grey)

    Quick drying, easy to apply, two part epoxy primer for high performance protection.
  8. International Interstrip AF

    Interstrip Antifouling Stripper AF is specially formulated to effectively remove old antifouling from fibreglass, steel, aluminium and wood. Available in 1L and 2.5L.

    Starting at: £27.20
  9. International Cruiser 250 - 3L

    Part of Internationals new generation of antifoul, designed to protect in all but the harshest fouling conditions

    Starting at: £89.95
  10. International Cruiser 250 - 750ml

    High performance antifoul, designed to give protection to sailing and power boats up to 25 knots in all but the harshest fouling conditions.

    Starting at: £32.85
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Antifouling paint guide

International guide to applying antifoul

International Antifouling Paint Coverage Chart

Everything You Need to Know About Antifouling Paint

What is antifouling paint?

Antifoul is a specialist marine paint designed to act as a barrier coating to prevent any marine life from growing on the hull below the waterline. It does this by using biodcides to create an environment that discourages biological growth.

How do I prepare my boat for antifouling and apply the paint?

The video below, put together by International Yacht Paint gives a great summary of typical antifouling application. Of course always make sure to read the safety sheet for the particular paint you are using to make sure you have all the correct personal protective equipment.


Many more helpful resources similar to this video are available from the International Yacht Paints website.

 Our top tips for antifoul prep and application are as follows;

1. Always make sure you are wearing the correct PPE (consult safety sheet for paint you are using), antifouling paint can be nasty stuff!

2. Check the weather! Like most paints antifoul is best applied on clear, dry mornings. Unfortunately here in the UK you might miss the boat (no pun intended!) if you wait for the perfect morning, however trying to apply antifoul in heavy rain is not a good idea!

3. Don't let your paint tins get too cold. Bring them inside overnight to ensure they are a reasonable consistency when you go to apply.

4. Lightly sand the bottom edge of your masking tape around the waterline, this helps give it a nice, clean line when your paint has dried.

Is all antifoul the same?

Unfortunately not, there is a plethora of antifouling paints available on the market to suit different craft and fouling conditions.

Most of the boats in our marina choose what is called 'self-eroding' antifoul, the most common type of antifouling paint used on inland UK waterways. Self-eroding antifouls (as the name suggests) gradually begin to dissolve once submerged as a strategy for preventing any organisms from clinging to the structure. This makes renewing the paint every couple of years incredibly important. The most popular self-eroding antifouling in our marina is International Boatguard EU.

Also available on the market are harder antifouls, sometimes called slow polishing antifoul. These disintegrate at a slower rate and are suitable for performance and high speed craft or for harsher fouling conditions.

Slow polishing antifouls are also used on aluminium outdrives, where self eroding paints won't properly adhere to the substrate. International Trilux 33 and Prop-O-Drev are slow polishing antifouls specially designed for use on aluminium outdrives.

How much antifoul will I need for my boat?

To work out how many tins you will need to antifoul your boat you will need to know the approximate coverage of the paint you are using, the size of the tin and the area of your hull. Fortunately the coverage and size of the tin are always displayed on the paints packaging, however to work out the area of your hull does take a little bit of arithmetic, luckily International Yacht Paints have put together a guide to working out how much antifoul you will need with all the relevant formulas.

How often should my boat be antifouled?

This depends entirely on where your boat is, what type of antifoul you use and what type of use your boat is serving, so best to seek local advice. Our marina is located on middle reaches of the River Great Ouse, a fairly typical inland UK waterway, and we recommend our customers (with GRP hulls) have thier boats craned out for antifouling at least every other year with a self eroding antifoul such as International Boatguard EU or Hempel Classic Antifouling.

*These are guidelines only.  LH Jones and Son ltd (Jones Boatyard) take no responsibility for the incorrect use and subsequent damage as a result of following these guidelines.  If you have any doubt when following the above guidelines, it is advised you contact your nearest boating expert.