If the area that the soft shelled barnacles are attaching is anywhere
near a ZINC, this is common. They will eventually or should disengage
and fall off from the paint before they fully harden their shell.
Whats happening is that the zinc is 'locally' neutralizing the
electronic charge from the copper oxide, it also means that the zinc is
'working'. If the barnacles are forming far distant from a zinc
location, then you may have a paint 'problem'.


In article , Karin Conover-Lewis
wrote:

Which specific Interlux bottom paint did they use? There are a few of them,
and they behave differently. In any event, barnacles after three weeks would
annoy the hell out of me, too. But it might just be a very difficult season
down there -- are your neighbours having the same problem? If you have
neighbours with the same bottom paint but you're fouling and they're not,
you have a strong complaint.