sealant

[kachina.livejournal.com]

i just finished transfering an image onto a bookcase using charcoal and i was wondering what would be the best way of sealing it since i would hate for somebody to accidentaly rub against it and for it to come off...

thanks in advance!

eta: the bookcase isn't made of real wood, by the way. just a cheap imitation with a wood veneer on top.