Best way to varnish is two cans - one gloss, one matt.
You spray the gloss first, which is harder wearing but looks bad, then the matt which looks better but is softer wearing.
Then, when the mini starts going shiny you know the matter has worn through and it's time to give it a wash down and a recoat with matt.
Also worth buying a pot of brush-on gloss for covering the glass bits afterwards, makes them look much better.