Building a temporary flange
So, because this fiberglas mold will be 2 part (one for the bottom half of the hulln the other for the top half of the hull) I needed the create a temporary barrier (flange) which would be the separation line between the 2 mold halves.
First step was to roughly saw the shape of the hull out of some MDF board, and attaching it to the building board at the exact height (the flange must be set on the widest part of the hull, so that the mold has no negative angles - a part can't be releases from a mold if it has a negative angle)
Then I placed a large piece of thin cardboard on top of that, and used masking tape the eliminate the gap between the hull and flange.
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