I would imagine it would work ok if you sprayed it on lightly with an airbrush or spray bottle, but personally I find misting just-printed decal sheets with light coats of Crystal Clear or Dullcoat from a can a lot easier and less trouble. Whatever liquid setting agent you use, if you apply it too heavily you'll probably make the ink run or bleed.
Second on the adequate dry time. If you're using an inkjet, that's WET ink hitting the page and needs EXTRA dry time on decal paper as the ink is not soaking into the paper as it does with normal paper. I suggest at least an hour dry time before handling. Once done, rather than Future, I would spray a light coat of gloss lacquer. This seals the ink to the page and strengthens the decal without taking away the ability to use decal setting and solvent solutions.