I tried G-Flex on mine. I cleared a 1/8-inch gap to fill and tinted it with graphite. It didn't work on any of the perpendicularly butted scarf joints (perpendicular ones), but it did work on the fancy forward rail scarfs that aren't directly perpendicular to the grain. Next time I'll clear a full 1/4-inch, awlwood, then fill with black 3m 4000 or SIS 440.
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