Ah fellow australian! If you can\'t find any testor\'s dullcote, you could try looking for \'Model Master Lacquer Overcoat\', and make sure you get the \'Lustreless (flat)\' type, not the glossy or semi-gloss type. I\'m in Sydney, and I couldn\'t find any testor\'s dullcote for ages, and I was using this Model Master stuff instead because I suspected it was similar, as MM is a subsidiary of testor\'s or something like that! Anyway, now I have got some testor\'s dullcote, and guess what - the Model Master one is EXACTLY the same: it smells exactly the same, it behaves exactly the same, it looks exactly the same. So maybe you could try finding that one instead!
Good luck for the GD, I can\'t wait!!
-sebastian
edit: oh yeah, and I agree with ritual - you\'re better off using jsut the straight matt varnish, rather than gloss first with matt over the top. The gloss does give better protection, but I think it can sometimes give a slightly different finish...you don\'t want the pressure of making sure there are absolutely no shiny bits left. Plus it IS GD, so the minis are going to be handled, but not TOO much, or too roughly (I hope!).
In any case, you have the option of putting your mini on a plain white handling base - that\'s what I\'m doing - so that way, nobody will be touching the mini at all. So if you do that, you technically don\'t need to varnish at all.
edit: ok ok one more thing@!! I keep thinking of more to say haha
If you can\'t find the testor\'s dullcote or Model Master lacquer overcoat, then I would suggest you just avoid varnish altogether and use the display base!