Those drip pans were never painted but if you want to paint them, no problems from me. When I cleaned my stove in the Starcraft, I was looking around for cleaning materials besides oven cleaner. I bumped into a website with all kinds of home DIY solutions. Baking soda was advocated for stove and oven cleaning. I didn't think it would work but it works well, but slow. The trick is to keep the powder wet until all the grime is dissolved. I sprayed a layer of baking soda with a spray bottle and covered it with plastic wrap. In three days, 40 years of grease and grime were dissolved away.
Good luck with the cleanup.
