I've been looking around for Testors Dullcote spray for some time. I found out today that Antenociti's Workshop has got a limited stock in. I've ordered a few cans for myself but thought I'd put the word out... there are 37 cans left in stock as of ten minutes ago!
I have used the Lacquer version several times and can testify that it is the best totally flat varnish I have ever used. However I do find that hand brushing to a consistent standard is quite hard. This may be just me but I'd rather use a spray version and have been on the lookout for it for months.
The original formulation of the spray version of the Dullcote fell foul of EU regulations because it contained Toluene. This new formulation works just as well - so I'm told.