M300 Q&As

Is the M300 Antifouling compatible with all types of hulls?

Yes, it is particularly well suited to the composite exterior hulls owing to their polyester base.

In case of wooden exterior hulls, it is necessary to use a suitable primer for reasons of porosity

In case of metal exterior hulls, we are concluding to define the best options with the inspection office Bureau Veritas, which shall guarantee an ideal service life and efficiency. If your hull is made of metal or aluminium, we request you to be patient.


Does the M300 Antifouling require a special preparation for the hull?

The principle is simple and applies to any coating in case durability is required: the hull must be in an excellent condition and free of any osmosis blisters. Thus, an M300 application does not use any preparatory operation for the hull that must be carried out by a meticulous professional. It is however essential to remove the previous antifouling layers and give it an anti-osmosis preventive treatment using an epoxy primer. As mentioned, a light abrasion of the frame with a 120 grit sandpaper is sufficient for an excellent adhesion. For more details, please refer to the application guidelines.


What is the service life of the M300 Antifouling?

The effective service life of the product is a minimum of 5 years. However, we do recommend applying a new coat at the end of this period.


Does the M300 Antifouling not require any cleaning at all?

No coating can be maintained fairly well, without ever requiring any cleaning. The navigation frequency and speed play a significant role in this regard since the friction of water on the hull gets rid of a significant part of the bio-film that is formed by destroying the organisms that try to grow on it. On the other hand, a period of prolonged immobility shall require a light brushing of the exterior hull during a dive or with an automated cleaner, or when using a high pressure cleaner during a replacement of anodes, for example. The long-lasting nature of the M300, the fact that it neither decays nor crumbles, facilitates in smoothly carrying out such harbour operations. Furthermore, in case of a colony grows on the bio-film, the adhesion of the encrustation is very weak and cleaning it becomes very easy.

Note, however, that in case of very dirty waters, do not allow the bio-film to grow   because it will stay on the hull, since the M300 Antifouling does not erode. If this bio-film grows, there is a risk of it establishing a territory suitable for other organisms to settle there. In this case, underwater cleaning must be done more frequently. In the West Indies in particular, we recommend a brushing every three months, since brushing is easy due to the non-adhesion of the bio-film.


Is the M300 Antifouling a medium of electrolysis?

No, the copper coating is too thin for this purpose, in addition to every copper grain being encapsulated in the resin, which acts as a binder, thus being insulated in a way.

On the other hand, certain grounded underwater parts (flaps, etc.) are able to counteract the copper’s activity. In the same study as that of the application on metal hulls, we shall soon be offering a suitable solution for these components. Meanwhile, we recommend an antifouling treatment suitable for metal that your ship chandler will recommend to you.


Can the M300 be dyed?

In a way, yes. It involves pure metal, and the effectiveness of the M300 is based on the purity of the surface. Hence it takes after the colour of copper, which is reddish brown. On the other hand, this surface can be oxidised faster by an application of a suitable acidic solution that will turn the colour of the metal into dark grey-brown. Oxidation does not alter the biocide properties of copper.


What is the cost of a M300 treatment?

We shall respond using the basic assumption that you are in possession of a hull prepared in accordance with the technical specifications. Therefore, we will discuss only the application.

We shall consider the example of a 7 m motorboat, which is the most common type of boat. The submerged surface of its hull is about 15m2, which will require 3 kits of M300, i.e. a budget of €567 inclusive of taxes, or €38/m2.

Let us now consider an example of a 12 m sailboat. The submerged surface is about 36 m2, which will require 7 kits, i.e. a budget of €1253 inclusive of taxes, or €35/m2.

We can thus conclude on a cost price ranging between €35 and €38 per m2, inclusive of taxes and exclusive of labour, (which will vary according to whether the application is done with a roller or a spray gun). This cost can be amortised over 5 years at least.

At the most, the cost of treating your hull with M300 will thus be €8/m2/year inclusive of taxes


By way of comparison, a high-end "classic" hard-matrix antifouling from a leading and recognised brand costs about €20/m2 inclusive of taxes, i.e. a respective budget of €325 incl. of taxes and €705 incl. of taxes. A new coat will have to be applied every year undoubtedly...

At the least, this solution shall amount to €20/m2/year inclusive of taxes


Based on its minimum service life (5 years) the M300 is thus 2.5 times more economical than a classic high-end antifouling product.

And we are not taking into account two elements in this calculation: neither the increase in prices of the antifouling paints every year throughout the time period, nor the decrease in fuel consumption if you sand your M300...