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Antifouling choice

Synonyms: Anti-grow paint, under water paint. Other spelling: antifauling, anti-fouling, anti fouling.

Published 19-03-2011 23:09 - Modified 26-09-2012 10:49

Different water qualities and temperatures produce different types and varieties of algae and growth. Therefore, when making the choice of antifouling, important that this is tailored to the trade. Even a big difference between between nearby ports. This is due to discharges (gray water), pollution, inflows from rivers, no or poor water flow, speed of flow of water, sunlight and shade (such as trees and buildings).

It should be answered to the question: Does the trade fully, or mostly sporadic, fresh, brackish or salt water? (Tropical areas with lots of sunshine and high temperatures, require extra care. Similarly, trade lanes and ports where it is known that there is strong growth and locations of release and additional flow along the ship.)

Antifouling, hard or soft?

Broadly speaking there are two types of antifouling.

  1. Based chemicals (biocides). The z.g.n. "Hard antifouling.
    One of the advantages of a hard antifouling that the intermediate wet sanded or polished to be. This provides a smoother oppervak ​​and less resistance, so more speed. Hard antifouling am also frequently used in stationary vessels.
  2. Based on motion. The z.g.n. "Self-polishing antifouling", also called polishing or eroded.

The biocides are released by the sweeping water along the hull while sailing a layer of antifouling afslijpt. There is therefore always a fresh layer of antifouling available. Also covered accretions while sailing off.
Self-sharpening is a (brittle) layer to the hull, that at the slightest release, sometimes with all plant and making the surface rough. When the ship for a while in the box is without hazards, the growth is attached to the fuselage. With regular boat will be seen virtually no growth.

Antifouling is subject to strict environmental regulation. There are products not be sold in the Netherlands. Environmentally biocidal antifouling its most aggressive form. For many organisms and is toxic biocide, the hull therefore free of fouling. The disadvantage is that a biocide leaching process and therefore slowly released into water courses. After the coating loses its protective effect over time and at the end of the season leaving a porous, hard layer. After a number of layers - which evolved over the years have formed, these must first be removed before another layer can be applied. Because of the environment are many types of biocidal antifouling prohibited.

The copper-containing antifouling may be sold in the Netherlands is limited. Yet the most common copper-based antifouling. Copper is a heavy metal, is also toxic. A less harmful (if less effective) as the active ingredient in antifouling dichlofluanid is chlorinated rubber. The less effective functioning of money but not for the newer copper-based brother Chlorinated Rubber Plus.
Copper and biocide

Antifouling is under water and a copper-biocide paint below the waterline, which gets its effect from the self-sharpening feature. For anti-fouling paints are many resources available silicone-based, enzymes, biofouling (including through nanotechnology), epoxy with and without copper oxide, organic biocides or bioactive material in different forms and many other variants. All these paints dissolve slowly during the season.

Copper Coat is a hard copper-filled epoxy-coated copper which "resolved" and can only be applied to polyester boats. Once properly installed (in full accordance with the guidelines, dry hull, all existing road layer, temperature and mixing ratio well within the margin), this coating 10 years and prevent almost any growth without polluting the environment with biocides. An additional advantage is that it very greatly reduced risk of osmosis. Low maintenance, but the low light sanding every year in order to activate the copper.

The other 2-component epoxy coating underwater alternative ecoBOTTOM (ecoNAUTIC). Not harmful to the environment, the water resistance combined with durability, the water will not be charged and therefore the water body is not affected. When the epoxy is applied correctly in accordance with the rules is this hard, smooth, flexible, durable, impact resistant, and vapor-proof, chemical resistant and durable and non-toxic. When applying for the processor, it also offers benefits such as non-toxic, solvents, odorless, no explosion, and between the layers does not need to be sanded. ecoNAUTIC is user friendly and without dilution process with a brush and mohairverfroller. It covers well, stays on vertical surfaces and flows very smooth. When the underwater coating is applied in the prescribed manner, the year well and provides a long lasting protection and a clean hull.

Also regularly switch from salt to fresh water and vice versa helps. Organisms that occur in freshwater, often can not survive in salt water and vice versa.

Selection table.

When the water type is known, there is a choice in the type antifouling:

SaltwaterBrackish waterFreshwater
Biocidal XX XX XXX
Chlorinated Rubber
Chlorinated Rubber Plus XXX XXX XXX
Copper-bearing XXX XXX X
Copper and biocide free
Epoxy underwatercoating:

Coppercoat XXX XXX XXX

XXX Great, XX Suitable, X Less suitable, -Not recommended