911 varnish is the product of dilution of asphalt with a thinner. It has good liquidity. Painted on the substrate surface such as concrete, mortar or wood, it can quickly penetrate into the pores of the base layer, and after the solvent volatilizes, it will be firmly bonded to the substrate. The coating film formed by 911 varnish is relatively thin, and it is generally not used as a waterproof material alone, but only as a supporting material for some waterproof materials. Before laying the waterproof linoleum, it is coated on the base layer such as concrete, mortar, wood, etc., which can quickly penetrate into the pores of the base layer, and after the solvent volatilizes, it will be firmly combined with the base surface.