I finished the 3 infantry units & 1 artillery gun for my late 19th/early 20th century imaginations campaign. I applied 2 varnish coats, one spray-painted mat varnish, then a gloss varnish applied with a paint brush.
I was not entirely sure the gloss varnish would work out ok, but it did. I have the practice of first trying the varnish coat on a few figures first, before applying them to the whole bunch.
I am quite happy with the results. Below you see them, using my vintage wooden block set to build a small fort.