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konastab01
Best to cut rot out and splice in new wood and join with something like Repair Care.
If you can't splice in new, you can also rebuild and fill with Repair Care.
The other stuff has questionable longevity when used outside. It doesn't seem able to shrink and expand with the wood, so it cracks, and water gets in. Inside, it's probably fine, if the fill is large enough to expand and contract with the wood.