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| Oblique patterns |
| Patterns that are neither perpendicular nor parallel to a given line or surface. This refers to patterns that follow a diagonal angle across the wall or to patterns printed on the bias. |
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| Occasional piece |
| A small piece of furniture for incidental use, such as end tables, coffee tables or extra chairs. |
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| Odorless paint |
| A paint such as a water-base latex paint or an oil- or alkyd-based paint which contains an odorless mineral spirit as a thinner; produces a minimum amount of odor during application. |
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| Oil |
| General term for a water-insoluble viscous liquid. |
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| Oil Absorption |
| The ability of a pigment to absorb or use up a quantity of oil or vehicle in becoming wetted. The oil absorption of a pigment will affect viscosity and gloss. |
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| Oil base paints |
| Paints whose films form solids by the air-induced crosslinking of certain unsaturated plant oils known as drying oils. Oxygen is consumed in the process. |
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| Oil finish |
| A clear finish produced by rubbing an oil, such as linseed or tung oil, on bare or stained wood. The oil is rubbed to a soft, glowing finish. Also called Danish oil. |
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| Oil paint |
| Type of paint that uses either natural oil (such as linseed oil) or a synthetic oil (called alkyd) as the spreading and adhering vehicle. Alkyd paints are the most prevalent oil paint. Oil-based paint requires mineral spirits or turpentine to clean and thin. |
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| Oil pastes |
| Very concentrated mixtures of pigment and oil, which are of paste-like consistency. They may be used for tinting purposes, or for preparation of oil paints by the simple addition of more vehicle and/or thinners, with the necessary driers. These are also known as Colors in Oil. |
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| Oil polish |
| Finish produced on wood by successive thin coats of linseed oil, accompanied by rubbing motion at the time of application. Also refers to any polishing material containing oil as one of the essential ingredients. |
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| Oil rubbing |
| Process of rubbing the dried film of a finishing material with oil and pumice or some other suitable abrasive. Linseed oil thinned with naphtha or turpentine is sometimes used, as are light mineral oils, such as neutral oil, straw oil, and paraffin oil. |
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| Oil stains |
| There are two types: penetrating and non-penetrating. Penetrating oil stains contain dyes and resins that penetrate into the surface; non-penetrating oil stains contain larger amounts of pigments and are usually opaque or translucent. |
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| Old wood |
| Stems and branches that developed during a previous growing season. Old wood is usually darker, rougher and older looking than wood of the current season, or new wood. |
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| Oleoresinous |
| Made by combining oil and hard resin by heating them together. |
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| On center |
| A point of reference for measuring. For example, "16 inches on center" means 16 inches from the center of one framing member to the center of the next. |
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| Opacity |
| Refers to how transparent or translucent a wallpaper is. If the opacity is poor, it usually means the wallpaper is a light color or does not have an intermediate layer between the decorative surface and the substrate. Primer-sealers that contain titanium dioxide will help prevent show-through from existing wall conditions. |
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| Opaque coating |
| A coating that hides the previous surface or coating. |
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| Open doorways |
| Door openings that have no casing or decorative trim placed around them. |
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| Open grain wood |
| Wood in which the pores are easily seen (e.g., walnut, oak, mahogany). |
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| Open riser |
| A staircase without risers, in which the vertical space between treads is left open. |
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| Opened seams |
| Seams that have separated between two strips of wallpaper. Causes include poor adhesion, usually because of improper wall preparation, and overworking of the wallpaper during installation. |
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| Orange shellac |
| Reddish- brown shellac that has not been bleached. |
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| Orange-peel finish |
| A textured finish created by applying watered-down joint compound with an airless sprayer. |
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| Organic adhesive |
| A tile adhesive that contains volatile organic compounds or solvents; also referred to as mastic. |
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| Organic colors |
| Pigments of animal, vegetable or dye-stuff origin; those containing carbon, hydrogen and oxygen but no minerals. |
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| Organic mastic |
| Also simply called mastic. This solvent-based or water-based adhesive cures by evaporation. Mastic is generally used on walls and floors; not in places subject to heat. |
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| Organizer system |
| Any system of shelves, drawers, closet rods, baskets, etc. fitted into a closet to maximize usable space. Such systems may be hand-built or prefabricated. |
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| Organosol |
| Film former containing a dispersion vinyl, resin, plasticizer containing more than 5 percent volatile content. |
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| Orientation |
| The placement of any object or space, such as a window, a door or a room, and its relationship to the points on a compass. |
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| Orifice |
| An opening or hole, especially in spray equipment. |
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| Out of register |
| When two or more ink colors on a pattern of wallpaper are printed out of line with one another. This results in a ghost-type image or total misalignment. |
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| Out-corner tile |
| A trim tile used for turning a right-angle corner in a countertop or similar installation in which three adjacent planes (two vertical and one horizontal) are tiled. |
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| Outside corner |
| A corner formed when two walls join, facing away from each other, usually at a 90-degree angle. Outside corners are typically found in L-shaped rooms or surrounding boxes built around pipes and ductwork. |
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| Outside corner molding |
| A molding that has been pregrooved to fit on an outside corner of two walls that meet at a 90-degree angle. These moldings protect corners from abuse and can hide mismatched patterns. |
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| Over-the-post railing |
| A balustrade in which a continuous handrail is attached to the tops of the newel posts. |
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| Overcure |
| Caused by an aftercure or by being subjected to too high a temperature or too long a period at a proper temperature and resulting in a product less resistant to aging. |
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| Overdoor hook |
| Hanging units, such as baskets and shelves, that are attached to the back of a door with metal clips. The metal clips are thin enough to fit in the clearance space between the door and the jamb. |
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| Overglaze |
| A thin glaze added as a final step to a decorative finish. It can be the original glaze thinned somewhat or a new, thinner glaze in another color. |
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| Overgrainers |
| Long, flat-bristled brushes used to apply paint detail, generally on dry, previously grained surfaces. |
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| Overlap |
| Applying a second layer of coating onto part of a wet layer of the same coating. Done to provide better coverage, uniformity, and hiding. |
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| Overlapped seams |
| A type of seam in which one edge of the wallpaper laps over another edge and is not double-cut to form a butt seam. They are rarely used except when correcting out-of-plumb outside corners, archways and soffits. |
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| Overspray |
| Sprayed paint that does not land on the targeted areas of the item being painted. |
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| Overspreading |
| Covering more area with a coating than is intended by the manufacturer. |
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| Overtrimmed wallcoverings |
| The result when too much selvage is removed either at the factory or by the installer. This results in a mismatch on the edges of the wallpaper because part of the print will be missing. |
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| Overworked |
| The result when a wallpaper strip is stretched or pulled away from the wall too many times. Take care not to overwork wallpaper because you can damage it, causing the seam to gap apart after drying. |
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| Oxidation |
| Combination with oxygen, drying, burning, rusting. |
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| Oxidize |
| To unite with oxygen. |
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