(A varnish is made by cooking resins in a hot oil until resin and oil form a chemical bond.) Wiping varnishes are just what the name implies-straight varnishes that have been thinned enough to be wiped on with a cloth. Blends consist of an oil (or oils) mixed in with a varnish. The difference between these two is subtle. If you see “contains petroleum distillates” on the label, then it’s one of these finishes. Both types do this by adding man-made resins and solvents to keep those resins in solution. Oil/varnish blends and wiping varnishes were created to speed up these poky drying times and make application less fussy. The results can be gorgeous, as long as you have the necessary patience. Regular reapplication is a must-“once a week for a month, once a month for a year, once a year ever after,” as the saying goes. Rushing the process, or applying too thick a coat, causes wrinkling, which has to be sanded off. And it takes five to seven coats to get a protective film. You have to wait at least two to three days for each coat to harden. That may be a good thing in terms of limiting your exposure to VOCs, but applying it is an exacting, drawn-out process. Pure tung oil is easy to identify because it contains no solvents. They all share the benefits that tung oil imparts to a finish-durability, water resistance, resilient hardness, and color stability-depending on how much of the oil they actually contain and what form it takes. Penetrating tung oil finishes come in three varieties: pure tung oil, oil/varnish blends, and wiping varnish. Choosing the right type of tung oil finish Oil/varnish blends and wiping varnishes are faster-drying, more practical options, but such terms rarely appear on labels. While there are many advantages to using it, pure tung oil takes two to three days to harden, and needs at least five coats. How many coats of tung oil should be used? Pure tung oil vs linseed oilĪmong natural finishes, tung oil surpasses shellac and linseed oil in hardness, durability, and water resistance. It enhances the color of your wood, offers excellent protection and is eco-friendly. Originating from China and South America, tung oil-an extract from tung-tree nuts-is a natural drying oil that coats your fine wood furnishings with a transparent, wet finish.
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