Higgie I think it works fine. I used it for 6-7 years without issue including on soft maple. Over time it can start to thicken up, and I suspect that's when I had my issue.
I used to keep a gallon can of it, and then I would buy it in quarts and as I used it, I would top off the gallon can so that it would stay full/not skim over. But over time I think it just started to thicken up and maybe wasn't thin enough to penetrate properly.
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