Reminder - They don't want a lot of contact between the wig and the support. Some cancer patients can go through periods of heavy sweating, especially during the summer. One of the purposes of the stand is to let the wig dry after they take it off. Most say to use a good polyurethane on the top piece just for that reason.
Information from other Woodturner groups:
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Milk paint with General Finish high performance.
Hollow form with removable top. For treatment and beyond. River birch base and Cherry top.