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Mix butter and Crab Boil in a small bowl, set aside.
Place potatoes and 2 tablespoons of butter mixture in 2-quart microwavable dish; toss to coat. Microwave, covered, on HIGH 6 to 8 minutes or until potatoes are tender. Alternately thread shrimp, sausage, corn and potatoes onto 8 (12-inch) skewers.
Grill over medium heat 12 to 15 minutes or until shrimp is cooked through and vegetables are tender, turning occasionally and brushing with remaining butter mixture during cooking.