Spoke prep, glues, etc, are unnecessary. Properly tension a wheel to begin with, even today's rear wheels with extreme asymetrical offset and it'll be fine. The "glues" are handy to cover loose spokes residing in a flat spot area to buy time. Not everyone for various reasons can drop off a wheel for a rebuild right away.
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life