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Paint a base coat. When it is dry, tape off sections for the first color of stripes.
Paint the stripe sections, remove the painter's tape and allow them to dry. Check the paint information for drying time. When painting stripes, be sure to use a minimal amount of paint on the brush to prevent drips or runs from ruining the pattern. Also, be careful not to leave the painter's tape on too long, or it may begin to pull off the undercoat of paint.
Then tape off the blue sections and paint them. Remove painter's tape and allow walls to dry.