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Expert's Corner — moisture

How to Choose a Finish: Part II

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How to Choose a Finish: Part II

For an overview of choosing a finish please refer to “How to Choose a Finish: Part I.” To better understand finishes and their differences, it’s very helpful to put them into categories by the way they cure. You may think the resins—polyurethane, alkyd, acrylic, etc.—make the big difference in finishes, but they don’t. Consider, for example, that polyurethane resin is used in varnish, water-based finish, two-part finish and in some lacquers. If you have used any two of these finishes, you know they are very different. The curing process the finish goes through is far more significant for understanding each...

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TIP: Penetrating Finish

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The term “penetrating finish” is one of the most misleading in the vocabulary of finishing because all finishes penetrate. The term is generally used to describe just oil finishes, which dry slowly so they may penetrate a little deeper than faster-drying finishes. But depth of penetration doesn’t have anything to do with protection for the wood, and it’s here that the term becomes misleading because many people think it does, and some manufacturers claim it does. The common descriptive phrase is that the finish “protects the wood from the inside.” But the quality of a finish that creates better protection...

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