I don't turn a lot of acrylic. When I do, it is usually because a customer has requested a special pen with school colors, or in one case a gold cross in a royal purple blank. I paid 60 USD for two custom cast acrylic blanks with the crosses inside for a new priest's ordination. Such blanks usually are very expensive, and I want them to look the best I can possibly make them, and I don't want them to shatter on the lathe, so I want them securely glued to the tubes. So I paint the blanks instead of the tubes.