A spread coating of polkadots is arranged to promptly and is readily formed polkadots. A spread coating of polkadots includes: that a primer coating process (S1) and coating dye on the surface of an object is arranged, at those with brightness between the color of first and second inter coat on the lip surface of object for forming a primer coat layer; One water droplet-forming process (S2) forms water droplet on the surface of primer coat layer, spraying using one; The surface of first base coat process (S3) decline-forming of the coating dye of black on the water forms the first inter coat by a low pressure spray; Second base coat process (S4) of coating dye of the bright color on the surface that the first inter coat shapes passes through second inter coat of low pressure spray table; A fully dry method (S5) decline of dry water spray; A top coat layer is formed, by coating a colourless transparent paint in the rear surface that water droplet is completely dried.
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