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Expert's Corner — penatration

Oil Finishes and Moisture Resistance

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Oil Finishes and Moisture Resistance

Oil finishes provide very little moisture resistance. This is because oil finishes (boiled linseed oil, 100% tung oil and mixtures of oil and varnish, often sold as Danish Oil) don’t get hard, so they can’t be built up on the wood to provide a thicker moisture barrier. You have to wipe off all the excess after each coat. If you drip some water on an oil finish, the water will penetrate quickly and raise the grain of the wood, causing a smudge mark like the one pictured. If you live in a relatively humid area (not the desert), the surface...

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