To paint over ANY surface without having to sand, use a product called "ESP Easy Surface Prep", available at hardware and paint shops. Wipe on, wipe off & paint in 90 minutes. Works well over enamel paint without having to sand. SAVES HOURS of work!
Every couple of months sprinkle a mixture of baking soda and a tablespoon of your favorite fabric softener over your mattress, let it sit for an hour, and then vacuum it up. Gets rid of dust mites and freshens the mattress. Baking Soda Tips.