I thought oil type finishes needed to penetrate into the wood for them to work properly. Wouldn't applying a sealer first stop the Tru Oil from doing this? Seems that if it just sitting on top of the sealer it would take far longer to dry. Tru Oil's spec sheet does mention Rosewood but makes no mention of sealing it first, just says it's an oily wood and might need some thinner added for penetration.

Pasted from their website:
Tru-Oil has a difficult time penetrating and drying on oily woods (i.e. ebony rosewood and cocobolo). If using an oily wood, you can try using mineral spirits to thin out the Tru-Oil or seal the wood prior to the Tru-Oil application.

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