I have made a number of drying racks 36" long by 6" wide. I use 1/2" or thicker plywood and put two inch long nails from a nail gun in them about two inches apart. Cheap , quick to make, and disposable. Works well for spraying and drying my boxes.
When spraying the walking canes I make, I screw a cup hook into the bottom end and hang it up to spray and to dry.