Woodworker's Journal 2009-33-5, страница 64
Finishing Hotline money spent. But there is Another chapter in the green finishing story is the new focus a way around that. More on nontoxic paints. There is an ever-expanding list of products and more, single- available for both interior and exterior use. component, self-curing water-based coatings are being offered to kitchen cabinetmakers, and they match oil-based polyurethanes in durability. They've long been offered as floor finishes and are slowly becoming more popular for furniture as well. While water-based coatings are generally considered greener, there are aspects to them that make them less green, at least in some minds. The resins used in water-based coatings are typically synthesized from petroleum, a nonrenewable resource that has a fairly high carbon footprint, thanks to the energy needed to extract and ship it. By contrast, the resins in oil-based varnish and polyurethane are made from modified linseed, tung or soy oil, all renewable-source plant oils grown right here in the U.S. The tradeoff is natural, renewable, local resins with a higher Finishing continues on page 66 ... Still, water-based coatings contain far lower amounts of VOCs than their solvent-based counterparts. For example, a typical nitrocellulose lacquer will contain upwards of 75% solvent, most of which is VOCs, while its water-based counterpart will contain only 10% or less. There are even zero VOC water-based coatings. Pros and Cons Although water-based coatings are lower in VOCs, clear water-based finishes are also a bit weaker. For instance, water-based polyurethane has about the same abrasion resistance as oil-based, but it has lower solvent, chemical and heat resistance. One could make the argument that if the finish does not hold up as long and you must refinish more often, the extra solvent involved in early refinishing offsets any savings you made initially. Of course, refinishing also means more time and ORIGINAL stains and MADK IN i:nc:i.an'I) Distributed in the USA ORIGINAL stains and Same Great Products You've Trusted for Years... 1-8Q0-5BRIWAX
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