Anyone familiar with the Seahawk Line? Specifically the VMG or Silver Bullet products? They appear to be one in the same and are comparable to VC-17. Their info says it's formulated to directly overcoat VC-17 and SR-21. Instead of copper it uses zinc.
While it is douchey in the extreme that Sea Hawk continues to produce and sell TBT anti fouling paints in places where it is still legal, what most people don't know is that they continued to do it here in the States where it is not. That is, until the company owner and officers went to prison for it a couple of years ago.