repeated applications of Watco Teak oil tend to darken light colored ash a bit over time, at least relative to regular Watco oil. Might be the varnish in the Watco teak oil ambering a bit with aging.
If you want significantly darker rails, I would suggest applying stain before oiling, or mixing a little stain in with the penetrating oil. Ash seems to take up the Minwax cherry stain very nicely, especially if you first use the Minwax stain prep.
EZ-Dock modular docks
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