It actually sprays quite well. It even comes in spray cans.
However, it stays tacky a long time and dries slowly, so you have to
protect against airborne dust and wait to rub a lot longer. Factories
that use it often have ovens or heat lamps to force dry it quickly.
1.) Becomes tack-free really fast - less dust in tacky finish
2.) Cures (or in lacquer's case, completely dries) really fast faster ready to rub out defects
3.) Melts one coat into another, so "witness lines" aren't created by
over rubbing or fixing defects.
On the plus side, if you can keep out the dust, poly won't blush, and
it's more durable than lacquer.
Without special spray booths, heat lamps, etc... I'd simply wipe the
I've sprayed poly from an airbrush with heavy nozzle. Don't remember how
much I thinned it but it worked fine for a small box. I think the reason
that manufacturers use lacquer instead of poly is speed. Poly is more
durable but dries slower.
Poly is actually easy to spray if you can spray paint. The viscosity
is about the same as a quality enamel, and thins to spray as needed,
more dependent on your equipment and the temps than the material
As pointed out, the bad news is that build coats are too long in
Load some in the gun and shoot a pint or so.
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