Why teak ships still favored copper sheathing

Did Bombay shipwrights use an antifouling treatment instead of copper on teak ships, and did the Royal Navy adopt it?

The treatment existed, but needed frequent renewal and performed less reliably in the North Atlantic, so the Royal Navy generally retained copper sheathing.

Bombay shipwrights used an antifouling treatment on teak ships, but it needed frequent renewal. It also worked less reliably in the North Atlantic than in the Indian Ocean. Copper sheathing reduced the need to expose the hull for another application. Reapplying the treatment required taking a ship out of the water or heeling it over, with Royal George cited as a warning about the latter operation.