I want to know the right way to winterize the bilge area in a
fiberglass boat that is on a trailer, and is covered with a boat cover.

The owner manual suggests me to add anti-freeze into the bilge area for
winterizing. But I am wondering if water in that area may eventually
soak through the resin and get into the fiberglass and cause whatever
damage in the hull. Because of this worry, I have already dried the
bilge area with a rag (only takes 5 minutes). Now, I am worrying the
opposite thing: The bilge pump may be designed to be placed under water
all the time. If I dry the bilge area, the bilge pump will become dry,
and I am wondering if drying it may actually hurt it. On the other
hand, isn't the bilge pump comes from the manufacturer in a dry
container?

Any idea?

Thanks.

Jay Chan