I work from home - printing canvas on my Z3100, and roll coat sealant on the canvas. Primary concern is to make sure the roller is free of dust and hair. A few times I've seen small flecks of lint or dust on the canvas. Will the customer see it? I don't know but if I do then I redo it if I can't remove the dust.
So keep the room animal and dust free as much as possible. It took me a while to get my canvas quality up to a standard where I was happy to sell to customers - if you go down that track you'll be more in control of quality plus make more profit.
Neal
www.photorestoration.co.nz