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With the wooden elements painted and dry, begin installing the metal balusters. Insert the metal rods into the pre-drilled holes in the handrail and base. Ensure they are correctly oriented and spaced. Secure each metal baluster by drilling a pilot hole into the ends that meet the wood, then fastening them with screws. Use a level to ensure all balusters are plumb and properly aligned. Finally, apply a bead of caulk around the top and bottom where the metal balusters meet the wood, as well as around the base of the newel post, to seal any gaps and create a clean, finished look. Smooth the caulk with a wet finger or tool. Any caulk that gets on painted surfaces can be carefully wiped away or painted over for a seamless finish.