Tips for Undercoating and Protecting Painted Bases?

[ignis-fatuus]

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? 

[OSHIROmodels]

Sticky backed plastic with varnish round the edge to stop peeling?

[Silent Invader]

My minis are organised into units for the various Rampant rules and to keep track of them, I attach a Unit Ident to each base.



Using thin superglue, the piece of paper is fixed in place with excess glue wiped over the surface to seal it.