You can let it dry a year and heat will still drive unhardened oil out. Wood pores are little tubes. Oil sealers goes in, harden on each end, and stay soft in between. You heat it, gas/water vapor inside pushes it out. So heat it first to get it all out, then clean it and prime.
PS I soak hardwood for hours and adjust my weighting to account for the weight the unsealed wood gains.
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