Pettit Marine 1792 Prop Coat Barnacle Barrier Quart

I sail my boat in the Caribbean. It sits in brackish water and is used for cruising and offshore fishing. A year ago I applied Pettit Trinidad Pro on the bottom and Pettit Marine 1792 Prop Coat Barnacle Barrier on the shafts, props and rudders. The bottom has held up very well with hardly any fowling. However, the metals are covered with barnacles every few weeks. My mistake. I should have used the bottom paint on the metals as I have done in the past. The Pettit Marine 1792 Prop Coat Barnacle Barrier was a huge mistake.