Actually, I believe that TBT is allowed for certain exceptions... and I don't believe that it is illegal to bring it into the US if the boat is painted with it..
From a Maryland PDF
Tributyltin Anti-Fouling Paint
Federal and State laws have placed severe restrictions on the use of anti-fouling paints that contain tributyltin (TBT) as an active biocide. Except under specific conditions paints containing TBT no longer may be applied to recreational vessels. TBT is an ingredient that has been found to be extremely toxic to fish and oyster larvae. Anyone wishing to apply paints containing TBT must first obtain a permit from the Maryland Department of Agriculture (410) 841-5710. Permits are not required to apply approved paints from spray cans of 16 oz. or less (commonly referred to as lower unit paint).
That would indicate to me, that is is legal for certain uses, but the uses are highly restricted, and use on recreational vessels is mostly prohibited. However, I doubt this applies to vessels from outside the US, provided the paint was applied prior to arriving in US waters. I believe it can still be used on aluminum hulled vessels, which can damaged by copper-based anti-fouling paints.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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