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Water marks are hard to remove, give them a go with a random orbital sander, but you’ll probably have to remove a fair bit of material before they’re completely invisible.
Finish with Osmo Polyux if you use coasters / aren’t too bothered by marks, aging etc. or Fiddes Clear Glaze Matt if you want it more hard wearing. Two very thin coats of Fiddes worked in with a foam roller, it’s easy to build up too much and end up with a plasticy finish on the surface. Osmo is easy to apply and will look / feel the best but isn’t as durable or waterproof.
Can anyone recommend a finish for a light oak dining table. Also, is there something to apply before the finish to remove water marks or do I sand it all?