Armor All in the engine bay?

[jermasaurus]

I'm going by what I was told and I have to stand behind my instructor on this one. He is the most reputable person I have ever known and has all the credibility anyone could ask for. He has been ASE master certified for Quite some time, Director of the automotive department at JJC, taught my Engine rebuilding class, electrical/electronic diagnosis, automotive fuel systems,automotive performance diagnosis, Automotive service 1,2,3,a and 4 and just retired last year.
If you don't think it will mess up the sensor, go try and coat the outside of the most expensive sensor you can find on any of your cars. Use a scope or graphing meter to check the voltage output, and tell me it hasn't changed.
-Jeremy