I do not know if the factory primes before or after assembly in the QB's. However, the wash primer they use only offers marginal corrosion protection by itself. For most, that level of protection is more than adequate.
If you are concerned about operating and storing your aircraft in an extreme environment, and feel you need the most robust protection possible, on and under structure, you would be better off priming before assembly with one of the two part epoxy products.
Corrosion X is also popular and gets excellent reviews, however I have never used it or been around anyone who has.
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RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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