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Welcome to the Bunnings Workshop community @Chingy. It's splendid to have you join us, and many thanks for your question about revitalising a dining table.
If you provide us with some images of the table showing the current coating and condition, then our helpful members will be able to provide some helpful preparation steps. Please let me know if you need a hand uploading images.
You'd generally use polyurethane on a dining table as they are resilient to heat and knocks to a certain extent. However, you wouldn't typically put hot items on a dining table and instead place them on a placemat or coaster. Polyurethanes also don't typically come with a food-safe grading as that is normally reserved for products used in food preparation areas, like chopping boards or kitchen benchtops. These food-safe products are normally in the form of an oil like Feast Watson 250ml Kitchen Timber Oil. An oil's downside is that it is not as hard-wearing and durable as polyurethane.
Please let me know if you have any questions.
Mitchell
I'd recommend water-based products @Chingy. They are just as durable, don't smell as bad, and are much easier to clean up once you finish. I always use water-based products but recently went back to using oil-based to see if I was missing out on something. Nope, straight back to water-based for me. I'm currently using Cabot's Satin Water Based Cabothane Clear Polyurethane Timber Varnish, and it's a joy to use.
Mitchell
