Both are overkill for that duty. That's why I recommended paint. Easier, less expensive, adequate for the duty. Go with enamel if you want more durability, but since the covers are rarely moved and stored under cushions, I recommend using whatever you have leftover from previous projects that is otherwise going to waste by sitting in your garage.I'm nearly certain I will never have to do again....here is a question...which would be best....epoxy or varnish?
Thank you to everyone for their suggestions. Pat