Place the hens on a wire rack in a large roasting pan. In a bowl, combine lemon juice, butter, paprika and 1 teaspoon each of thyme, seasoned salt and garlic powder. Pour half over the hens; set the remaining mixture aside for basting. Combine salt, pepper and remaining thyme, seasoned salt and garlic powder; sprinkle over hens. Bake, uncovered, at 375° for 30 minutes. Baste with reserved lemon juice mixture. Bake 30 minutes longer, basting occasionally, or until the meat is tender and juices run clear.