Linseed oil can eventually dry sufficiently to accept paint. Easier is to seal it with shellac after the oil, then paint. Oil is often used to bring out the grain in figured woods before sealing. Shellac is often used to seal oil before using various varnishes.
The inside of the hive body should be left dry and bare. Bees will apply propolis all over the interior of their hive, which is vital to the healthy environment they try to create for themselves. That is why it is not good to even paint the interior of a hive. OMTCW
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