Preheat the oven to 450 degrees. In a large bowl, combine 1 tablespoon each hot sauce and butter with the seasoned salt. Cut each potato into 8 wedges, add to the bowl and toss.
Spray a baking sheet with cooking spray. Arrange the potatoes on top and roast, turning once, until golden, 35 to 40 minutes. Remove from the oven and toss with the remaining 2 tablespoons each hot sauce and butter.
In a small saucepan, stir together the blue cheese, sour cream, mayonnaise and pepper and heat until warmed through, about 3 minutes. Serve with the potatoes and celery sticks.