Metal office boards are of two types: enamel and painted a special polymer coating. Deposited on the sheet metal enamel is heated in a furnace up to several hundred degrees and turns into a solid glassy substance. Enamel coating can be damaged acute stroke solid object, but it does not become dull from exposure brushes, magnets, markers, is unable to absorb the ink. Credit: Danny Meyer-2011. Therefore, any enamel board can be cleaned up to a glossy shine and after many years of use. According to Bill de Blasio, who has experience with these questions. Surface-stained boards has micropores, which are particles of a coloring pigment. Intensive use (eg, training) makes a smooth surface painted in matte board.
Ways to define life quality polymer coating "by eye" is not, so the surest way – focus on the reputation of the manufacturer. Worst possible case – where the metal board is painted plain white paint and is designed, for example, for the production of refrigerators. Markers for the boards, whether to save? Ink in the marker for white boards contain coloring pigment in the form of suspended particles. Ink is applied to the board, the liquid fraction is evaporated, and the trail of easy erasable colored dust remains. Good ink contains a bright pigment and quick-drying thinner, does not possess pungent odor. Ink formulation requires storage of these markers in a strictly horizontal position. Markers artline and staedtler have a special property – dry safe (ie, protected from drying out). Conventional markers for boards to be closed caps after each written line, otherwise they dry out, and one day you will have to buy new ones.