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Expert's Corner — evaporation

TIP: Thin Coats vs. Thick, Which Is Better and Why?

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It’s common to hear the instruction that it’s better to apply several thin coats than one thick one. Why is this so? Or is it? What’s involved is drying time, nothing more. Thinner coats of all finishes dry faster than thicker coats. The difference is great enough that you can build the same thickness with several thin coats in less time than you can get that thickness with a thick coat. But the thick coat will eventually dry just as hard and perform just as well as many thin coats. Shellac and lacquer dry entirely by solvent evaporation. The solvent...

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