You should probably avoid stain altogether, most are oil based and contain a lot of VOC's (volatile organic compounds) that leach out of the stain into the air over time. Best to look for a paint low VOC's that once are cured are child & food area safe. After paint look for Varnathane, it's a varnish/sealer that is safe after it cures and it will make the finish shinier and will protect from moisture etc.
Cool that you made your own enclosure. You should post a picture
