Few years ago I only had maple for a material to work with and did the spar / min spirit seal for about 15 min when no more bubbles were coming out of the plug body. I had several finished plugs split (soft maple) that were sealed with spar / ms. In the same run I also did a dozen darters and epoxy sealed (envirotex lite) them and had no splits. The following winter I tried Smith's CPES and had splits again when using soft maple, I do not think there are enough solids in either Spar/Ms or cpes to fill the voids in soft maple, at least not without a second bath in the sealer.
So now, for me at least, when I use soft maple I seal it with a 2 part epoxy.
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