Oil for a tub? I would have guess the epoxy that we have on the shelf.
We don't see as much oil interior as we used to, simply because most surfaces painted by the homeowners are sheetrock with some wood trim. The water-based has less of a ''smell'' (VOC) to it; and holds up well for those uses.
Obviously we have oil-based primers to seal the wood... and BIN Shellac is preferred by many.
And most decent painters can apply a high gloss acrylic latex paint over the oil or shellac primer getting the durability.
The factories tend to use the laquer as it sprays easier with fewer imperfections due to the flash dry time; so much easier to layer coats and not wait.
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