A method for applying an aluminide coating, comprising: providing a component having an external section and an internal section, said internal section characterized by one or more internal surfaces defining a first internal cavity and a second internal cavity; providing a first elongated member defined at least in part by a size and shape corresponding to the first internal cavity; applying a first aluminum-based slurry onto said first elongated member; providing a second elongated member defined at least in part by the size and shape corresponding to the second internal cavity; applying a second aluminum-based slurry onto said second elongated member; introducing said first elongated member into said first internal cavity; positioning said first elongated member within said first cavity at a first location that is spaced apart from each of the one or more internal surfaces defining the first internal cavity; introducing said second elongated member into the second internal cavity; positioning said second elongated member within said cavity at a second location that is spaced apart from each of the one or more internal surfaces defining the second internal cavity; applying heat to the component, the first and the second elongated members; generating a first vaporized aluminum and a second vaporized aluminum within each of said first and second internal cavities, respectively; directing the first and the second vaporized aluminum towards the one or more internal surfaces; diffusing the first and the second vaporized aluminum into the one or more surfaces; and reacting the first vaporized aluminum with the one or more surfaces defining the first internal cavity to form a first aluminide coating; and reacting the second vaporized aluminum with the one or more surfaces defining the second internal cavity to form a second aluminide coating. providing a component having an external section and an internal section, said internal section characterized by one or more internal surfaces defining a first internal cavity and a second internal cavity; providing a first elongated member defined at least in part by a size and shape corresponding to the first internal cavity; applying a first aluminum-based slurry onto said first elongated member; providing a second elongated member defined at least in part by the size and shape corresponding to the second internal cavity; applying a second aluminum-based slurry onto said second elongated member; introducing said first elongated member into said first internal cavity; positioning said first elongated member within said first cavity at a first location that is spaced apart from each of the one or more internal surfaces defining the first internal cavity; introducing said second elongated member into the second internal cavity; positioning said second elongated member within said cavity at a second location that is spaced apart from each of the one or more internal surfaces defining the second internal cavity; applying heat to the component, the first and the second elongated members; generating a first vaporized aluminum and a second vaporized aluminum within each of said first and second internal cavities, respectively; directing the first and the second vaporized aluminum towards the one or more internal surfaces; diffusing the first and the second vaporized aluminum into the one or more surfaces; and reacting the first vaporized aluminum with the one or more surfaces defining the first internal cavity to form a first aluminide coating; and reacting the second vaporized aluminum with the one or more surfaces defining the second internal cavity to form a second aluminide coating.