Bruce In Bangkok wrote:

What is happening is that the O.P. is applying a thinner then previous
layer of solids to the hull. This layer is providing the required anti
fouling function for the period between haul outs.
...
In essence probably most people apply more anti fouling then they
require and then complement themselves when they haul annually and
find no growth ...

As the "OP" I believe I am qualified to state that Bruce has summarized the
situation accurately. In case the point was not adequately explained (or
more likely not adequately understood by some) in earlier posts, let me
restate the point he the idea is to save money. Could that point have
possibly been overlooked?

BTW it is a sad comment on the state of Usenet (and this group in
particular) that an effort to provide helpful information results in some
(but not all) of the responses to this thread. I am not one to give up on
this group, but is this really the best we can do?

--
Good luck and good sailing.
s/v Kerry Deare of Barnegat
http://home.comcast.net/~kerrydeare