I would use, BC Timeless Glossy or satin on a matte canvas. This is what I have placed in over 10 different hospitals in my region with no problems.
Glossy canvas, still needs an overcoat especially in a hospital, where you never know what the conditions will be. I find it much easier to coat matte than glossy canvas.
Other coatings to consider, Glamour II, or Clear Star's lineup. Also the new re-done Lexjet product set is very nice also. Plus they ship in a modern jug, not a paint can, so it's much easier to work with them.
Paul