Yes, you can the Vittoria as a preventative sealant.
5 of my 6 bikes are tubular. I don't use sealant as a preventative measure. I hear folks in the SW use it as they have nasty little things called goatheads. If I get a flat on the road, I first try sealant as a fix. I use Stan's as all of my valve cores are removable. If that doesn't work, I carry a spare tire to swap. Using the Stan's takes under 5 minutes to see if it works. Swapping tires takes 10 minutes at the most. Flats are easy to fix and somewhat rare (knock on wood) so I don't see the point of prevention.