I should read this site more often!! Lots of fun stuff. I do make goblets of all sorts and kinds of wood. I called a manufacturer of CA glus years ago to find out what it is. I knew it has been used in medicine and that it must be non toxic when dried. It becomes an inert plastic...so I have been using the thin CA glue and swirling it in the inside of the cups and goblets after they are dry and sanded. I use 2 hemostats, one with a small wad of waxed paper and one with a small wad of paper towel to sop up the puddle at the bottom of the cup. This must be done with plenty of ventilation and quickly. Wood is insular and can hold hot and cold drinks easily. This is the only finish I've found that is stable and has no taste.