That area must be flattened before fiberglass is applied. Does the boat have an outer keel or skeg? If the bottom has a vee, the area will need to be. you can do a “V” cut, with the point of the v facing the tips of the swallows. if that dont make since then try this: before you wet anything out, fold the lap under with your hand by the tail. you can easily see the excess glass poking out the oppisite sides of the tail. that excess is what you. For jobs requiring narrow strips of fiberglass, cutting tape strips cleanly, from a single large fiberglass roll, can save the expense of buying smaller rolls of fiberglass tape. First, find sharp scissors or a fabric wheel cutter, a flat table and a well-lit workroom. It will prevent cracking and splitting.
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