We turned our attention to cleaning out the plank seams on the dinghy, many of them were full of old seam compound and very little cotton caulking. Many of the seams were approaching 1/8" so for those we felt comfortable running a half round blade down the seam on an oscillating multitool. Be sure to check for seam bevels before doing this on other boats, sometimes the plank seams were cut to form a shallow V that holds the cotton caulking in the seam.
A few other seam reefing tools.
This is the old brown brittle goop coming out of the seam.
Here's the type of cotton caulking we expected to find. We think that maybe when the decision was made in 1950 to fiberglass the boat that the seams got filled with seam compound vs traditional cotton.
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