I have a 13' fiberglass sailboat. I bought it 3 years ago for almost
nothing because there were some serious cracks in the hull from improper
trailering. I put 3 new layers of fiberglass over it and it is fine. It
was too light before (well, at least for me anyhow) and now I really like
it; the 30 extra pounds on the bottom did a lot to improve it's stability
without making that much of a difference in speed.

I have decided it is time to fix some of the other problems. (I fixed the
cracked dagger board last year.)
1) The ropes from the jib (excuse me, I am new to sailing and don't know the
language...) go into some camcleats on a seat going across the boat.
http://www.frontiernet.net/~toller/Seat.jpg
The seat is attached to the boat by 6 screws, 2 each to little shelfs on the
sides and 2 to the daggerboard housing, and the screws are working their way
out.
http://www.frontiernet.net/~toller/Detail.jpg
I have tried to fix it with longer screws, but it is obviously is not
adequate. I need to fill the holes with something to hold the screws
properly.
I don't know anything about boat construction, but presume there is some
wood under the fiberglass to take the screws.
Anyhow, I need some advice on how to fix this problem before a good wind
just pulls the seat out.

2) The previous owner slathered some white gunk over all the cracks to try
to hide them. (He claimed it was to fix them, but he wasn't that dumb.)
The white gunk immediately cracked through, presumable where the underlaying
cracks were. They really haven't gotten any worse in three years, but I
expect they may some day and would like to prevent that.
http://www.frontiernet.net/~toller/Crack.jpg
They are actually more conspicuous than the picture suggests.
Would just putting some fiberglass over them help any, or do I have to do
something more drastic to be useful? Thanks.