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Expert's Corner — oxygen

TIP: Successfully Spraying Varnish or Oil Paint

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The usual finishes that are sprayed are lacquer, shellac and water-based finish. These finishes dry fast, sometimes too fast in warm temperatures to successfully brush onto large surfaces. Spraying overcomes this problem. Oil-based varnish, including polyurethane varnish and oil paint, can also be sprayed, of course, because any thin liquid can be sprayed. But you need to be aware of a significant difference. Varnish dries much slower than the other finishes, and unlike lacquer, shellac and water-based finish, each coat should be allowed to fully dry before the next coat is sprayed. You may typically spray lacquer, for example, spray...

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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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