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Home > Painting Basics > Preparation Good preparation is essential for a good quality finish.
New Wood. Painting new wood. Painting bare wood. how to paint...
Sandpapering. How to sandpaper. Using sandpaper. Grades of sandpaper. Wet and dry sandpaper. Emery paper. Wooden surfaces to be stained or painted by the decorator usually have major roughness already removed, but are seldom smooth enough for sand- papering to be entirely dispensed with if a first-class result is required. As with other seemingly simple operations, there is a right and a wrong way of doing this, and the importance of doing it properly is not always appreciated. Providing the woodwork feels only slightly rough when the hand is passed lightly across it, fine sandpaper is generally most suitable. It should be held perfectly flat against the surface; when large areas have to be papered, a flat piece of cork, wood, or rubber can advantageously be employed as a pad, and the sandpaper wrapped around it will be kept in level contact with the wood. Ready-made sandpaper-holders are obtainable and are very useful. The most important points to observe are to maintain even pressure and never to rub across the grain of the wood. If undue pressure is exercised on any part of the Work, there is risk of leaving a faint hollow or depression, which, though it may not be obvious at the time, will probably be quite noticeable after the finishing operation has been completed. Unless rubbing is done up and down the grain, when applying stains, the stain may dry out patchily, with some parts darker than others. In good-class work, any resinous matter in knots should be completely cut out, if this is practicable. Even a trace of free rosin in the wood will cause oil or spirit stains to creep away from these points, since the rosin tends to soften when wet material is applied. Sandpaper is graded from very fine to coarse. Sheets are code numbered on the back to indicate the degree of coarseness. For most work a medium grade is adequeate. For progressively finer work black emery paper is normally used, known as wet-and-dry because using it with water creates a very fine finish.
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