Napa has automotive lacquer, I have not tried it on my carvings but it has held up well on metal and composite work I have done over the years.
It goes for around 80.00 a gallon and needs to be thinned for spraying.
http://s98.photobucket.com/albums/l249/brianharnett/Wood%20Carvings/
http://harnettdesigns.com/