why do painters use sandpaper in polishing doors

Early sandpapers were made of natural minerals like pumice, flint, garnet, and emery fixed to a paper backing with glue or varnish. Nowadays, most sanding abrasives are synthetic materials в aluminum oxide, silicon carbide, and high-tech ceramic в that stay sharp longer and can be produced in microscopic sizes. Deposited onto backings of paper, cloth, or plastic, they are held in place with tenacious plastic resins that can withstand the heat and speed of machine sanding. With better technology has come a host of specialized abrasive products: sanding belts and discs engineered to withstand the rigors of rapid stock removal without clogging; sanding blocks that flex to follow irregular contours; plastic-film-backed "papers" so fine they can gently polish away defects without harming furniture's finish. Norm takes full advantage of these improved papers, using his orbital, random-orbit, and belt sanders to shorten the time he spends at the task.

But he always finishes up by hand, with a sheet of sandpaper wrapped around a sanding block. "A power sander can still leave little swirl marks," he says. "Nothing beats a final hand sanding for making sure a surface is smooth. "
Clog Stoppers The amount of abrasive on a piece of sandpaper affects the way it performs. "Open coat" papers have more space between each abrasive particle and so don't clog as quickly with dust. (Coarse grits are typically open coat. ) In grits finer than 150, where clogging is less of a problem, most sandpapers are "closed coat," covered completely with abrasive. Hardwoods and metals can be sanded with closed-coat papers; open coats are best for soft woods like pine. In addition, some papers are treated with zinc stearate, a soapy substance that prevents clogging. Don't use these so-called "nonloading" papers with water-based finishes, however; stearates can prevent the finish from adhering properly.

Sandpaper is an abrasive material that is often used at construction sites or furniture workshops. You can imagine it as plane having several teeth which rub on the surface of woods, metals, plastics or even glass. Its function and kind depend on how many teeth or grits per square inch the sandpaper has. Few teeth or grit per square inch mean rough sandpapers, while many teeth or many grit per square inch are fine sandpapers. Sandpapers are so useful that they are, in fact, needed in our own homes too. Here are the common uses for sandpapers: 1. Preparing Wood for Painting Have you ever noticed how smooth the wooden tables and chairs we see in exhibits are? It is because they are smoothed by sandpapers to get rid of wood splinters and grains. Fine sandpaper is used to smooth the surface before paint is applied. This makes the paint adhere better on a clean and clear surface. Not much of the paint is also wasted when you do this.

In addition, sandpaper can polish paint to achieve a more elegant, sleek and soft look. 2. Removing Grout Stain Are you tired of cleaning grout stains in between those tiles especially the ones on the floor and the bathroom? Sandpaper can be used to get rid of grout stains as you smooth those areas in a gentle manner. You will surely be impressed on what sandpaper can do in mere minutes that many detergents or chemicals fail to do in long hours. 3. Polishing Metal Aside from wood and paint, sandpapers can also polish metal surfaces. One practical use of this is to smooth metals with rusty surfaces so that the iron oxide may not be able to penetrate the whole metal and damage it completely. You can also polish the rough edges of a needle or the rusty parts of garden tables and chairs, and just repaint them after for a new look. 4. Roughening Some Materials Rough or coarse sandpaper can be used to roughen shoe soles so you won t slip or trip.

By rubbing the smooth soles with rough sandpaper, they can make better contact to the floors or grounds you walk on. This same principle may be used for those rubber or plastic materials beneath the legs of the chairs or tables in the dining or living room. To ensure that they will be held in place, they can be roughened a bit by coarse sandpaper. 5. Enhancing Accessories Fine sandpaper, as well as rough sandpaper, may be used to enhance your fashion accessories especially those which are made of wood, plastics and even metals. Sandpapers can make round edges be more defined and distinct, for further aesthetic appeal. 6. For Making Artwork Sandpapers also prove to be of great importance in making artworks. They may be commonly used by artists who dwell in mixed-media art. The simple sandpaper can add texture to their work when needed, or add softness to a very strong material, such as wood, to create contrast.

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