Preventing fouling on static objects is by far more difficult then on moving objects. Producers of toxic and silicon antifoulings make us of the movement while releasing the organism on a smooth surface. However, if a ship is less in use , like a coastal or a tug, fouling can accumulate easily. Thorn-D® is the only non-toxic antifouling which has managed to stay fouling free for a period of 5 years in row.