that can permit trays of similar width as drawers but they have not come into wide use. Shelves provide in all cases more storage space than drawers or trays, but are less accessible. Wall oven cabinets Stock wall-oven cabinets may be adapted to built-in ovens, coffee-makers, or other appliances by removing portions of the cabinet and adding trim panels to achieve a flush installation. Frameless cabinets provide for wall oven front panel widths equal to the cabinet width (see above). In such an installation the oven front panel occupies a similar profile as a cabinet door. Accordingly, frameless installations for wall-oven make most efficient use of the available wall space in a kitchen. This effect is difficult to achieve in typical face-frame cabinet installations, as it requires modification to the face-frame (essentially eliminating the face-frame at the oven cut-out). Cabinet finishes Cabinets may be finished with opaque paint, opaque lacquer and transparent finishes such as lacquer or varnish. Decorative finishes include distressing, glazing, and toning. The choice of finish can affect the cabinet's color, sheen (from flat to high gloss), and feel. High-pressure laminates or (HPL) are made from resin and paper components under high pressure; in contrast, ordinary wood does not sustain such pressures, and can be crushed to less than half its natural thickness in a hand-operated arbor press. The high pressure squeezes the HPL to such a solid density that it becomes highly resistant to damage simply because any utensil or tool striking the HPL will not have a force greater than the force used to form the HPL itself. In effect, the HPL has been dented in advance. HPL can be decorated in any pattern and is applied using contact cement and pressed in place using a "J-roller." It is cut slightly larger than the panel on which it is to be installed and trimmed using a router-like laminate trimmer along the edge. It may also be filed to obtain the final edge. While HPL became prevalent in the twentieth century, since the 1970s the trend has been away from HPL in favor of wood. Melamine is a coating for furniture board panels in carcases. Its unique white-in-color chemical formulation helps prevent damage by chemicals and gives it impact resistance comparable to HPL. Melamine coated boards are widely available in home centers for purposes such as shelving. Thermofoil is a plastic coating laminate applied to furniture-board.