Hull Below Water, Antifouling Treatment - Ockelbo B21 CAB Owner's Manual

characteristics, giving the boats hull a fantastic shine while preventing oxidation.M-400
chemical resistance is significantly higher than untreated aluminium.
We recommend regular rinse with clean fresh water on M400 treated surfaces. If you do
not allow aggressive substances to "burn", the surface works relatively self-washing
(hydrophobic) with fresh water. In that case, collections of salts and soils are washed
away. On untreated aluminium, these salts oxidize the aluminium and thus bound to the
surface. On surfaces that are in water (e.g. below the water line), a mild brush can be
used regularly to easily remove algae and the like, which mostly cannot get a good grip
on the M400, yet they are attracted by smooth/shiny surfaces. On other surfaces, a mild
sponge can be used in combination with a mild (pH-neutral) shampoo, followed by a
rinse. Regular car and boat shampoos work great. If desired, the M400 can be waxed and
polished like a car. However always avoid abrasive rubbing as this may damage the thin
layer's properties.
Despite the strong protection of the surfaces, please keep in mind that the protective
layer is very thin. Just like a fine ceramic frying pan, you should choose the right tools
and means for cleaning. Avoid aggressive chemicals and salt dries / burns in the surface,
as they will become difficult to remove over time. The use of abrasive methods for
washing (such as polishing discs or sponges) may gradually wear down the surface and its
protection. Strong basic chemicals are directly oxidizing on aluminium and should,
therefore, be avoided in any case, although the M400 is significantly better than pure
aluminium. The acid resistance of the M400 is relatively high, despite the thin layer.
However, as acids are also highly corrosive on pure aluminium, these should also be
avoided.
After many years of use, or in case of damages to surfaces such as hull repairs, the
treatment may be renewed. To get a good result, the complete hull should be polished
and treated again. As a minimum, at least full outside surfaces and/or full inside surfaces
should be treated. Partial treatments may result in a wrong visual impression (colour and
surface variations). Contact your dealer for further details.

6.2.2 Hull below water, antifouling treatment

The hull below water can be better protected by applying special hull antifouling, In
particular when the boat is used in salt water areas. It is very important to choose the
correct type of primer and top coat, suitable for aluminium hulls and for your local
conditions.
If the boat was delivered with antifouling from the factory (optional), Ockelbo have used
the following products:
 Primer: International Intergard 563 (white)
 Glue for anti-fouling: International Intergard 263 (grey)
 Anti-fouling: International Trilux 33 (black)
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