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5 or 7 strand wick. So that if the seam is tight you can pull off a strand or two for a better fit. Approximately 75 Feet per 2 oz. Roll.
Best choice caulking for tight planking. For varied planking, keep some Oakum on hand for wide gaps, and Caulking Cotton for medium-space gaps.
Typically, on boat seams, caulking is next covered by a marine paint. Once dry, the remaining space is filled with seam compound (one for above waterline, another for below) before applying final topcoat.