Wash all surfaces with detergent and water. Rinse the RV thoroughly. Be sure it is dry before proceeding.
Apply the polishing compound with a soft cloth. Use the orbital buffer to polish the gel coat. Move the buffer in a circular motion, pressing harder at first and then progressively lighter until you achieve a high gloss.
Apply a coat of wax to the polished surface. The wax will not only enhance the shine, it will preserve it so this process need not be repeated too soon.