Not always. Sometimes it`s inherent in the design. The same Challenger of mine that I referenced earlier was Ziebart rustproofed at delivery in addition to being new enough to have e-coat anticorrosion. The Challenger issue is injected foam they use in the sound deadening process. Jump in about 23:20 here, they`re amazingly proud of it. https://www.youtube.com/watch?v=WiVMvV_d1eY
There`s also the issue of rustproofing applications actually clogging the factory drain holes. Everyone except car and rustproofing salesmen will tell you these days that rustproofing is nothing more than a profit engine.
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