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Last I looked, practically all hair-sprays as well as art fixatives available in aerosol "bombs" employ nitrocellulose lacquer as the "fixing" material. In the US, Alberto VO-5 is acceptable for the purpose as it has no objectionable adulterants, and is available un-perfumed. Hair-sprays would always be questionable, and require testing and full disclosure of the material contents to be acceptable.
Iso-acrylate may be a good (synthetic) resin for use as a pastel fix, but the volatile solvents necessary to disperse it as an aerosol would be pretty nasty.
Traditionally, natural resins (e.g., mastic, damar) were dissolved in 200 proof alcohol (to eliminate water) and applied with a mouth or bulb atomizer. Overall, this would be a less toxic and more eco-friendly approach at much lower cost.
Degas is reputed to have used casein preparations to fix his pastels, and currently, there is a casein fixative for pastel on the market. A thread on this topic was begun in the "Paints, Mediums, Brushes & Grounds" section, but prompted very little input.
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