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Transducer Defense. Foul-Release.

Fouling on the face of transducers can reduce their sensitivity, decreasing bottom-echo returns and fish targets. Keep your transducer performing at its peak with Foulfree™.

Developed from the best foul-release technology on the market and in conjunction with world experts AIRMAR.

Foulfree™ is a revolutionary coating designed specifically to protect transducers from marine growth.


Fouling of running gear is a constant headache for boat owners worldwide. Propspeed®, the industry leader in foul-release coatings, has been tackling the problem head on for more than 20 years. Now Propspeed® is applying its propeller know-how to transducers to bring you Foulfree™, a revolutionary foul-release coating that protects transducers from marine growth to ensure accurate signal transmission. With the Propspeed® promise of proven performance, you can rely on Foulfree™ to keep your transducer free of marine growth for a year or more.


Why do I need Foulfree™?

Foulfree™ on the face of transducers can reduce their sensitivity, decreasing bottom-echo returns and fish targets and reducing the detail on the sonar image you receive. Foulfree™forms a slick surface marine growth can’t grab onto, keeping your transducer surface clean and clear.

Can Foulfree™ damage my transducer?

No. Foulfree™ has been tested and proven to have no adverse effects on transducers.

Is Foulfree™ environmentally friendly?

Yes. Foulfree™ is a specialized foul-release coating that does not poison marine growth or release any toxins into the marine environment.

How long will Foulfree™ last?

Foulfree™ lasts a minimum of 12 months, with an even longer service life in cooler climates.


* AIRMAR certifies that the application of FoulfreeTM coating on its transducers results in no loss in transducer performance..


Sustained clarity and visibility, with clear detailed targets.


AIRMAR certified to have no adverse effects on transducers.


A super slick coating that does not poison marine growth.

How to apply Foulfree

Keep your transducer signal clear with Foulfree, the best foul-release technology on the market.



🕭 Gloves and protective glasses must be worn at all times.

-🕭 For better adhesion of Foulfree™ Transducer Coating on plastic fairing (polyethylene, polypropylene, nylon, etc.), you may need to use a piece of 40 grit sandpaper —NOT included. Do NOT sand the transducer housing or face as it will damage the transducer, voiding the manufacturer’s warranty.

Surface Preparation | Transducer in service:

Remove fouling and/or any previous coatings from the transducer housing and face with the abrasive pad provided.

In case of heavy fouling, scrape transducer face with a metal putty knife without gouging the surface. Drag the putty knife across the transducer face at a perpendicular angle and follow with a wet sanding block. Never use a power sander or pressure washer on the face of the transducer.

Take care not to scratch or damage the transducer face.

Fairing blocks ONLY – To improve adhesion between plastic fairing blocks and the Foulfree™ coating, we recommend sanding the fairing block with 40 grit sandpaper – sold separately.

1- Abrade the fairing block with 40 grit sandpaper to achieve a roughened surface.

2- Remove any residue from sanding


Transducer Face & Housing:

1- Lightly scuff/abrade plastic housing and face of the transducer. Do not scour or deeply scratch the face of the transducer.

2 - Tape off any areas you do not wish to coat with the Foulfree™ Transducer Coating.

3 - Clean the transducer face with the XD Clean wipe provided. Immediately remove any residue with a clean, dry rag. Ensure the surface is 100% clean and dry before proceeding.

2. XDclean:

Clean the surface to be coated with our specialized cleaning wipe. XD Clean is transducer safe and helps to improve adhesion between the Foulfree coating and the transducer. Remove any residue with a clean, dry rag.

3.Applying Foulfree

We have included a small, high quality brush to provide the best result.

Pierce the seal of the tube using the lid. Squeeze a small amount of the Foulfree coating directly on to the brush.

Apply a thin layer of the coating on to the transducer. The idea thickness is between 50 and 100 microns. Make sure there are no heavy runs or sags. You will have 5 to 10 minutes to touch these up.

4.Dry Time

Foulfree™ requires a minimum of 8 hours to dry before launching. In colder conditions, 40–60℉ (5–13℃), wait at least 24 hours before launching.

Foulfree™ can sit out of water for extended periods of time in warm or cold climates with no adverse effects.


Each 15ml FoulfreeTM kit contains:

• 1 x XDclean wipe.

• 1 x FoulfreeTM 15ml tube.

• 1 x applicator brush.

• 1 x abrasive pad.

Outer box: 8 units per box.

The shelf life is 36 months.


FOULFREE aplicación

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