Yes you can. In fact many customers request this setup to achieve the super dark effect. Be sure to put a few more drops of the slip solution into the mixed solution as the surface of the tint is more tacky then the glass.
If installing our window film on a flat or very slightly contour glass, it does not require heat shrinking. For example, rear windshield for trucks and many side windows on the SUVs, mini vans, and trucks.
If going on a contour glass, for example not all but many side windows for cars and almost all rear windshield for most types of vehicle except trucks, the film needs to be heat shrunk with a heat gun on the outside glass prior to installing it on the inside.