Armond Perretta wrote:

Ronald Raygun wrote:

... presumably the length of time a coating stays effective is mainly
related to the rate at which the active ingredients leach out of the
paint (or the paint itself erodes), and this only happens when
immersed ...

... depending on the type and composition of the
paint, the antifouling properties can be adversely affected by prolonged
dry storage.

Interesting.

Perhaps I should have toned it down and presumed that "this happens much
faster when immersed" instead of "this only happens when immersed".

Any chance of quantifying this? I take it "adversely" doesn't mean
more (or even anywhere near as) adversely than when afloat, not even
when "prolonged" means you skip more than one or two summers.

Suppose you slap on a nice new coat and then launch. How different
would you expect the results to be after 18 months if you were
(a) ashore for the middle 6 months, (b) afloat the whole 18 months?

How many dry months can you "trade" for a wet month?