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Fixatifs are rather a compromise . . . the application of a varnish (that's what they are) over paper begs the question of the material's long-term resistence to yellowing and UV exposure.
For what it's worth, graphite on paper eventually becomes very permanent. It's been my experience that drawings over five years old cannot be changed by erasure. This is probably due to the nature of graphite platelets, which tend to "migrate" into the materials it comes in contact with.
As for the folding atomizer, I have one that 's over 50 years old, I use it regularly with no problem, and it's mighty handy to be able to apply my "studio mixes" of retouch varnishes and fixatifs without relying on packaged aerosols. To work well, it has to be clean, well-aligned, and no dents or burrs on the tubes.
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