You can spray the tiers, but as bakermama said if you are not even with your spraying you can get streaks which are a nightmare to deal with. I would definitely start with a pink fondant for the red and a chocolate fondant for the black so you don’t have to spray as much if you do decide to spray. I would also definitely try it out on a practice cake first. If you give it enough time, it will dry. You can also use the cool setting of a hair dryer to help speed along the process of drying. You also do not want to airbrush if you will be refrigerating the cake as the condensation can make the colors bleed. If you’re worried about the satin ice fondant (all I hear is bad reviews lately on them) then I would try out fondx…I have not personally used it but have heard a lot of great reviews. Good luck in whichever you do! <3
Tiff - MA www.facebook.com/sweetbeecakery
