Restore a used outdoor wood furnace by removing the trim, scrubbing off the rust, sanding down the surface, replacing any stove cement and cleaning the surface. Finish by polishing and buffing the surface before reattaching the trim.
Start the wood furnace restoration by preparing a work area that is well-ventilated and removing the trim. Scrub the trim with steel wool until any corrosion or rust is removed, and polish it. Scrub the furnace with a wire brush and steel wool to remove any rust. Sand the surface with 150-grit sandpaper, moving to finer grit as you go. Make sure the sand any crevices. Use a hammer and chisel to remove any old cement in the seams of the stove. Replace the old cement with new stove cement, and allow it to dry completely before finishing with the furnace.
Wipe down the surface of the furnace, removing any lint and dust. Rub stove polish into the metal using a lint-free cloth. Allow the polish to dry before applying another layer. After at least two layers of polish, finish by buffing the stove with a soft cloth or painting it with stainless steel paint. Finally, attach the trim that you removed earlier.