Artillery fungus it is! I can also confirm there is no spray or solution that will get the stuff off. As I'm sure you have read it takes the right combination of sun and moisture and it loves the reflection of a nice white hull. I used rubbing compound to remove the sticky little dots from all the smooth gelcoat areas the non-skid areas was another issue and I just did the best I could there but some remain.
The problem at my house was the previous owner used free wood mulch from the town dump, it has way too much wood pulp which the fungus loves. So, before compounding my boat I had to remove all of the wood mulch. That was five years ago and I haven't had a problem since.
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