Once a plank seam is caulked and painted, a flexible seam compound is put in the seam to protect the caulking. We bought two cans of the Interlux brand, the brown for underwater seams and the white for filling seams above the waterline.
What's the difference? Here's a note from the Interlux Tech Team: "The brown is for below the waterline as its made to withstand constant moisture, the white is for above the waterline as it will not dry out as it's above the water."
Some folks also mention that the underwater compound is brown in order to be a close match for the most common colors of bottom paints, while the white matches the popular white topside paint.
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