I used the dam method ... easy and works fine. Before the deck and hull are attached ... just make a little dam out of foam or whatever ... and make the end pour with filled epoxy. I used Cabosil aka fumed silica. Whether you use Cabosil, microballons or whatever ... the mixture isn't critical as long as it's water tight, doesn't crack and sticks to the boat.

Ken Blanton

: 18 foot Night Heron. NO hatches. End pour looks...fairly difficult.
: Saw in a book where guy made a small dam around 6" from
: bow/stern in hull...then filled it with epoxy. He used
: MICROballoons to take up space. googled Micro stuff. More than
: one option. One place ...fiberglass Supply had 32 oz for
: $4.30...other places it was as much as $30 ....is there a
: certain kind I should use? anyone know the ration of Micro to
: epoxy?