"Greg G." wrote in message
...

Mineral oil.
Apply until the wood will not absorb any more.
Buff it out.

Then watch as it picks up any dirt from the fingers that handle it, bleeds
oil when set in the sunlight, and catches dust on the oily surface.

Or, use a standard wood finish if you're going to have the bowl for dry use,
a curing oil like tung or walnut without resins, or lacquer.

Don't use surface finishes if you're going to use it for hot popcorn. The
Old Maids will make blisters.