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Expert's Corner — coat

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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Combining Water-Based and Oil-Based Products

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Combining Water-Based and Oil-Based Products

Water and oil don’t mix, but water-based and oil-based finishing products can be combined as long as the previous coat is dry. Water dries considerably faster than oil so you can apply an oil-based finishing product over a water-based product within a couple of hours. On the other hand, you should allow at least overnight, and often several days, before applying a water-based product over an oil-based product or you may get wrinkling or poor bonding.

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TIP: Ghosting

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TIP: Ghosting

Ghosting occurs when you sand or rub through one layer of finish into the one below, as shown in the accompanying picture. You can recognize ghosting when the problem area you’re trying to remove keeps getting bigger rather than smaller—like sanding through veneer. The term ghosting is the traditional name for this phenomenon. As it starts to appear, you see the “ghost” of the finish layer underneath. It is also called “layering,” which describes the phenomenon well, and “witness lines,” a relatively new term, which doesn’t. Nevertheless, it seems that witness lines has become the favored term in many recent...

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This Month, Nine Experts for the Price of One

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Looking back over our recent articles, we thought we’d celebrate some great ideas, hot tips, and super stories from our Finishing Experts. Read, learn and enjoy! 1.Glen Huey on Shellac: The lack of respect for shellac may be due to the fact that it, a natural resin, is made from a bug’s secretions – not bug droppings, as some think. A lac insect, about the size of an apple seed, ingests tree sap which undergoes a transformation before being secreted as a shell-like shield that covers the bugs. The secretion also sticks to tree twigs. If it is scraped from...

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