So I've gotten into the habit of using fender washer bases (thank you helpful LAF users) where I prime the bottom of the bases black and record some info pertaining to the manufacturer, name, number, etc. of the mounted miniature (see attached photo). I would like to protect the bottom of the bases as best that I can and stop them from chipping. Can anyone recommend a clear protective coating that will dry hard and stand up to the rigors of tabletop use?