I believe both Testors and Tamiya also sell window tint sprays. I had bad results with the one I tried. The idea with the tinted plastic sheet is you don’t tint your windows, you replace them. Use the original as a pattern. No spray, no dust.
If Dahm’s Window Tint is still available, try it. This is an R/C product, very strong tint. Very strong adhesive too! Apply to the outside of your window. Down side is, not good for compound curves (for instance, a slight domed window)