When boats are antifouled by boat manufacturers, the hull is often given little attention prior to the antifoul being appllied.
This can result in premature loss of antifoul as shown on my page for hull antifouling.
I am not suggesting that this is a fault, only that it can mean early lifting of the boat for re-coating.Wherever possible I prefer to carry out a multi-process preparation of the hull.
I start with a solvent wash to remove release agents from the hull, sanding to key the gelcoat, followed by a dust wash, again using solvent.
Then I start on the coatings with an antifoul primer followed by 2 coats of antifoul.
Halfway through the job the shores need to be re-sited to allow access to all the hull.
The pictures show a Glastron 249 undergoing that very process. You can see in the top picture how many stages are needed.
The bottom picture shows the finished job, in white I'm afraid, so you will have to take my word for it !!