I think it is the right moment to start the application process. After that, keep applying it until the desired number of coatings are reached (can be up to 10 coatings). Or else, divide the boat into let's say two or thee zones. De first zone is treated until 10 coatings have been reached, then go to the next zone etc… One zone a a time, keep working until finished. It is very important to start the process and finish it in one long haul, so no stopping in between. It is a good thing to keep one person occupied with mixing and distributing the coating.
The finished product is very lightly sanded, pref by hand, as to expose as many copper particles as possible.
You also mentioned that coppercoat is water bases, which is not true, of course.
You should be good for the next 10 years, which is a good thought knowing that it would have costed you +/- 120 euro's per m² now.