I also use Interlux ACT ablative. (ACT ablative copolymer Technology) This paint was under $100/gal. and one gallon did my whole boat (20'), 2 coats.
I sanded with 80 grit and applied 2 coats. That was 2 years ago, and it has not needed any additional paint since, just spots that a line wore off a bit.
I will paint with a different color when its needed so when it thins, I can see the first color coming through.
But the paint looks great for this season too, that will be 3 years (if it makes it)..
All good advice from members here,
Good Luck.
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