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Without elasticity, the varnish would soon crack, allowing water to penetrate the wood beneath. Prior to the development of modern polymer chemistry, varnish production was rudimentary. Originally, spar varnish was a "long oil" varnish, composed primarily of drying oil with a small proportion of resin, usually boiled linseed oil and rosin. [1]
After paint is applied to a surface the solvent evaporates, the pigment and binder will coalesce together to form a uniform coating. The solvent is water for water-based paints, and an oil for oil-based paints. Paint drying on surface. There actually is no chemical bond between paint and an underlying surface.
Sands easily. Sanding not needed between coats Oil-varnish blends (i.e. Danish oil, Teak oil, [30] "Tung oil finish") Enhances natural figure like a drying oil, but more protective and faster drying. Low, but more than pure oil finishes. Fairly durable, but may require periodic reapplication for heavy use areas such as tables and worktops.
The inclusion of a fatty acid confers a tendency to form flexible coatings. Alkyds are used in paints, varnishes and in moulds for casting. They are the dominant resin or binder in most commercial oil-based coatings. Approximately 200,000 tons of alkyd resins are produced each year. [3]
Pages in category "Wood finishing materials" ... Non-drying oil; P. Pettit Marine Paint; Polyurethane;
Some enamel paints have been made by adding varnish to oil-based paint. Although "enamels" and " painted enamel " in art normally refer to vitreous enamel, in the 20th century some artists used commercial enamel paints in art, including Pablo Picasso (mixing it with oil paint), Hermann-Paul , Jackson Pollock , and Sidney Nolan .
With oil-based paints, revising was comparatively easy. The disadvantage is that a painting might take months or years to finish, which might disappoint an anxious patron. Oil paints blend well with each other, making subtle variations of color possible as well as creating many details of light and shadow.
Thus, oil paint is said to be "oil-based", whereas acrylic paint is "water-based" (or sometimes "water-borne"). Example of blending technique with acrylics. Painting on wooden panel. A demonstration of blending with acrylic paint. No retarders were used. The main practical difference between most acrylics and oil paints is the inherent drying time.
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