It is generally recommended that you antifoul your boat every year. This is because build-up of fouling can have a significant impact on the performance of your boat, and can also lead to increased fuel consumption. Fouling can also increase drag on the hull, making it more difficult to move through the water. In addition, fouling can provide a home for invasive species, which can be detrimental to local ecosystems.
There are a few different methods of antifouling, including chemical and physical removal of fouling organisms. Some boat owners choose to do this themselves, while others hire professional services. Whichever method you choose, it is important to follow directions carefully in order to avoid damaging your boat's hull or harming the environment.