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I don't think that the heating is even necessary.
One of the first mistakes I made with the thinned spar varnish was letting a batch of darters soak overnight (which is what I had been doing with val oil). They absorbed so much of the sealer that when wired they did not float. After that I was just soaking the soft maple for an hour and that seemed to work fine.
I did experiment with some needles letting them soak a long time in it to make them heavier but that was on purpose... and they did take a long time to dry.
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