Antifouling is a specialised paint that stops marine organisms attaching themselves to the hull bottom. Its purpose is not appearance but performance.
Why does it matter?
- A fouled hull increases drag, so speed drops.
- The engine works harder, so fuel consumption rises.
- Over the long term, the organisms can damage the hull itself.
The key to the job is preparation
What determines the life of an antifouling is the surface preparation beneath it as much as the paint itself. Applied without removing old layers, grease and dirt, it will not hold.
A common mistake
Painting over a wet or dirty surface. The paint will not key, it flakes off within months, and both money and time are lost.
The steps
- Cleaning the hull bottom and surveying its condition.
- Sanding and surface preparation.
- Primer where required.
- Applying the antifouling coats (usually two).
- Respecting the drying times and planning the launch.
How often?
It depends on how much the boat is used and on the character of the water; the usual practice is an annual inspection and renewal when needed.
Frequently Asked Questions
How many coats of antifouling are applied?
Usually two, with an extra coat recommended in critical areas such as the waterline.
Does the old paint have to be stripped completely?
Yes, if the build-up has become thick or adhesion has failed. Otherwise it can be overcoated after proper preparation.
How long do you wait after painting?
It varies with the product and the weather; follow the manufacturer’s instructions and the technical team’s plan.
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