| 摘要 |
A coating of a rubber sponge material for a product to be used in water is provided, which coating is formed by means of applying water-soluble resin paint over a surface of the rubber sponge material such that the rubber sponge material is smooth and water-repellent, and such that a product made of the rubber sponge material won't absorb water to become heavy after it is immerged in water.
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