Wish it was that easy but better to wipe the impurities off so the paint sticks well.
Also, a tip from experience on painting that much metal and being tubular is a pain trying to get enough coverage. Turn your spray gun air pressure down and limit the trigger so your not putting too much paint down all at once and narrow the spray pattern and slowly put 2 coats on in one spray instead of trying to recoat after a 15 minutes or so time frame. Again just what I would do and less fumes and over spray is defiantly a plus.