[Bob Andersen]

It says on a can of Deft gloss brushing lacquer "this product must not be thinned or sprayed". Could be that's just for liability reasons or maybe it is specially formulated for brushing to retard the drying time and that doesn't work well when spraying ?

As for nitro cellulose - that's what they used back in the day and lacquers like Mohawk contain it so I assume it does something good