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To do it the right way, you should barrier coat it. But barring that, taking it down to bare metal, etching and then priming it, then followed by several coats of Trilux-33 is what I would do. The last coats I put on mine was back in August. It was previously coated with Trilux more then 2 years previously. Bottom was not to bad and a simple power wash took everything off. Very few barnacles.
Since it was coated in August, there is no growth to speak of. Of course the water has been a lot colder for the past 6 months since it was painted. I am also in brackish water and in a covered slip. I bring up the covered slip thing because there is only a limited amount of sun on the hull that way. The lack of sunshine tends to inhibit the worst growth which is usually along the water-line, extending down 6-8 inches. Extra paint should always be applied there anyway for that reason.
I have no experience with the other paint you spoke of. The Marinette community though seems to be mostly Trilux-33. Most seem to use that.
Hope this helps.
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