In the RV world to prime or not to prime creates "wars" on the RV list.  For my plane I am alodining and then using an epoxy primer. The epoxy primer provides a moisture barrier, unlike many other primers.  The primer I am using is AKZO #463 12-8 <http://www.aircraftspruce.com/catalog/cspages/akzoprimer.php>.  It provides a very scratch resistant surface.

Long parts are scuffed and painted with AKZO primer (no alodine).

If I only have a small part, and I do not want to set up the gun I will use Tempo Zinc Chromate Primer (in a spray can) <http://www.skygeek.com/a7-6889a.html>

For Alodining here are some links:
<http://www.eaa1000.av.org/technicl/corrosion/alodine.htm>
<http://www.rvproject.com/primer.html>

You can search the VansAirforce forums <http://www.vansairforce.com/community/index.php?> and search for primer or alodine.

You can also go to the Matronics lists and search the RV lists.
<http://forums.matronics.com/>

Good Luck

Larry Rosen
RV-10 #356
N205EN (reserved)
<http://lrosen.nerv10.com>