I built this coffee table with recycled hardwood flooring and used a biscuit joiner and biscuits to join the top. I've just started using hard wax oil. It looks like a varnish, but is made for mostly natural products.
How to apply hard wax oil to tabletops
A clear hard wax oil on your hardwood tabletop will protect the surface, preserve the look of the timber and give it a nice finish. Learn how to apply hard wax oil with this step-by-step guide: Applying Clear Hard Wax Oil To Benchtops.
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Meg also built these industrial-look benches using timber, glass and steel.