Applying Grid Patterns to Wood Surfaces Using Photosensitive Lacquers

The application of grid patterns to wood surfaces to study the strains associated with the cutting of wood has been complicated by the problem of finding a coating material that will not peel during cutting. The use of photosensitive lacquers is suggested as a suitable answer to this problem. The smooth wood surface is coated with a white two-part epoxy paint. The mixed paint is thinned until a thin coat, just filling the open cells, can be applied with a brush. It is cured at room temperature for 1 week. The surface coating is removed with fine abrasive papers leaving the cells filled. A smooth glossy surface is provided by a second coat, preferably sprayed. The annual rings should be visible through the coating. Negatives of accurate patterns as fine as 2,000 lines per inch are obtainable from firms specializing in photographic scale reduction for resist etching. The photonegative is brought into close contact with the lacquer-coated surface. A quartz-iodine lamp at a 2-foot distance, or unclouded sunlight can be used for exposure.

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