Well the only varnish I have right now is the old GW varnish (not so old that it\'s Purity Seal with the old label though), and have not bought their Purity Seal yet. PS is a great product but I\'m really liking the flat varnish on most of the stuff I\'ve been doing lately. A lot more cloth than armor... armor looks good with the slightly glossier feel I think, which means I should buy Purity Seal for that kind of model. Makes the hilights pop a bit more, which works for sharp edged materials.
As for sray technique... I just do it in the basement here since I don\'t like going outside

Just kidding... anyway I set the fig down usually on the spray can lid and hold the can 18\" away and tappa-tappa-tappa on the nozzle to get light coats on the model. Turn it around, do again, turn it around and hit from underneath this time, and then hit the other side from underneath. Wait a while, and come back and do it again for good protection.
The quick bursts of varnish have kept me from getting \"frosty\" or \"glassy\" varnish jobs for quite a while now. Both seem to occur when you put too much on at once.