| 摘要 |
An object of the present invention is to provide a durable excellent stain-proofing property to the surface of a coating formed on a substrate surface of a building board without deteriorating the surface of the coating. The present invention also, provides a stain-proofing agent containing silica fine particles, an aqueous solvent and, as a stain-proofing improver, an alkali metal compound and/or an alkaline earth metal compound and/or a phosphorus compound and/or a clay mineral. The present invention also provides a building board having an excellent stain-proofing property prepared by applying a coating composition onto the surface of a substrate to form a coat, and then applying a stain-proofing agent onto the coat while the coat is in an unhardened state or applying a stain-proofing agent onto the coat after subjecting the coat to a roughening treatment to enhance the adhesion of the stain-proofing layer to the coat.
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