Primer
Ditch,
I went with a Sherwin Williams high solids epoxy primer for my empennage kit. The pros (IMHO) are 1) good moisture barrier, 2) good scratch resistance and 3) few people would argue it is a bad idea. Con: 1) it takes a lot of time and effort. This is how I prepped and applied.
1) Used Dawn dish soap and scrubbed each part with a scotch brite pad using distilled water from Wal-Mart in ~20 gallon bin using about 7 gallons.
2) Rise part with distilled water in ~20 gallon bin using ~ 7 gallons.
3) Pick up parts with nylon/plastic gloves to dry.
4) Dry at least over night.
Check weather for next day
At least 60F during spraying
At least 10 degrees difference between dew point and outside temp
5) Mix wash primer 484684 (w/other componets)
6) Get paint booth blowers, paint gun, etc ready.
7) Suit-up with respirator, Tyvek suit, etc.
8) Apply wash primer
9) Wait at about 1 hour while before epoxy primer (while doing steps 10 and 11)
10) Mix 483928 with other componets (after shaking)
11) Let stand for 20 minutes
12) Apply expoxy primer
I did the above in a 8'x8'x7' paint booth I made in my garage.
It is a pain, but I am glad I did it. I did one part with an zinc chromate rattle can in high humidity and did not like the result. It was/is very easy to scratch.
For the wings and fuselage I ordered the quick build which comes with the Sherwin Williams P60 G2 wash primer already applied. The wings are ~90% done except for part of the bottom skin and the fuselage is maybe 50% done. I consider the parts that have been done already on the QB are the "more" structural parts. The remaining parts that I will complete will be with a rattle can of SW 988, which you can get at the Sherwin Williams Automotive stores. ~$10 per can. I may put another sealer primer over with zinc chromate, but have not decided yet.
I would also recommend searching the folowing link:
http://www.paintcenter.org/pexpertqa1.cfm
Dave Syvertson
Sugar Land, TX
RV-10
Go Fighting Sioux