Yea well I’ve been coating prints with the aerosol uv sprays every week for about 18 years and they have all been flat on a table. Three light coats. I’ve never ruined a print that I can remember. I rotate the print in three directions.
If you ever have spray running or blotching you are trying to lay down too much in one coat or the can is too far away from the print. It should be done in a wave motion. Just follow instructions on the can.
Now water based varnishes and hplv units are a different animal. I either use my Fuji sprayer with canvas push-pinned to a vertical surface or on an inclined angle.
The main thing in all this coating is don’t try to do it in one or two thick coats, then it could run or go blotchy.
John
At this size I would definitely mount the print vertically on a wall before spraying. Just go light and even, don't pause as you spray of course, and all will be ok. Personally I prefer buffing a few coats of Renaissance Wax after applying the first few coats of lacquer spray (Premier Art usually) but to obtain the best results you should use a lambs wool buffing pad attached to a polisher or random orbit sander which is considerably more effective. While I've also followed up with various aqueous coatings after the lacquer spray at least to me the wax method looks much better. FWIW, I don't prefer and never have sprayed horizontally but have by now sprayed thousands of canvas and paper prints. Unless its small I just think you're asking for trouble to spray a print laying down horizontally.
Good luck.
