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Old 10-30-2014, 05:26 PM
Cdenora Cdenora is offline
 
Join Date: Mar 2014
Location: Leon mexico
Posts: 72
Red face RV-12 so do I prime or not ?

IM so sorry to post this stupid question , but I kneed to know as I have read yes and no answers and its not clear to me I live in a low humidity environment but would like at least the minimum protection to guarantee the best results , and If I sell the plane I would not like to be limited by the corrosion resistance , want to keep it light to.

Im about to start my kit and im totally confused , what would be the minimum ?
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Old 10-30-2014, 05:34 PM
Alex Edwards Alex Edwards is offline
 
Join Date: Feb 2010
Location: Sydney, Australia
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The MINIMUM is the parts that are not alclad. In the instructions tell you where to prime. Check out section 18 of the manual for instance and it tells you to prime the flaperon brackets.

Everything else is an optional "improvement"
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Old 10-30-2014, 05:47 PM
Cdenora Cdenora is offline
 
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Default common thing to see in a rv12

so other than the specified sections that must be primed, what would be the common thing to see in a kit like this ?
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Old 10-30-2014, 05:48 PM
Cdenora Cdenora is offline
 
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Quote:
Originally Posted by Alex Edwards View Post
The MINIMUM is the parts that are not alclad. In the instructions tell you where to prime. Check out section 18 of the manual for instance and it tells you to prime the flaperon brackets.

Everything else is an optional "improvement"
so other than the specified sections that must be primed, what would be the common thing to see in a kit like this ?
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  #5  
Old 10-30-2014, 05:58 PM
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KALEWIS KALEWIS is offline
 
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Location: Jackson, OH
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Some have primed every piece and the inside of the skins. The outside will get primed if painted. We primed parts that overlapped in the structure. As far as the interior section of the cockpit, primed almost all of it since it will get touched and walked on. Not a big deal if you get the carpeted interior. We used SEM self etching primer from a spray can. It has held up well for 2 years of flying now. Minimal prep. Anything that is going to be visible once your done should be primed/painted for protection but as the argument goes.... That's optional.

Also used corrosion X on the finished product in the wings and tail section. A little goes a long way. It's a spray can style application.
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Old 10-30-2014, 06:41 PM
rgmwa rgmwa is offline
 
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Location: Perth, Western Australia
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The minimum is what the plans require, but the minimum to guarantee the best results depends on what you mean by `best results'. A brief on-line VAF poll I did when I started my build suggested that about 50% of RV-12 builders do no more than the minimum required priming, 25% primed overlapping surfaces, and the remaining 25% primed everything. The results might be different for other RV's, and it might also reflect the observation that most RV-12 builders are getting on in years and probably figure that the plane will outlast them anyway, so the time saved by not priming could be better spent flying.
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Old 10-30-2014, 07:22 PM
David Paule David Paule is offline
 
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Location: Boulder, CO
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My Cessna, unprimed, is 59 years old. It's spent most of its life in the dry states, but a handful of years, single digits, near the ocean. It has some light corrosion where there are lap joints. For example, between stiffeners and skin. Not all of them, though.

I'd say that a single layer of prime on one of the mating surfaces of a joint would be sufficient to guard against that. Perhaps on rib flanges.

On the other hand, judging from the number of people priming every last part, that must have some perceived desirability. And that's what I'm doing on my RV-3B, simply for resale value.

Dave
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Old 10-30-2014, 07:40 PM
waterboy2110 waterboy2110 is offline
 
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Location: SF Bay Area
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Section 5 on primer says it all. Personally - I've found that it at least adds 33% to the build plus the weight. Not recommended by someone who's doing it. My Cessna is a 35 year old FL plane that has held up well with Corrosion X. Do not apply Corrosion X until after it's been painted.
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Old 11-02-2014, 12:08 PM
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RVTrumpet RVTrumpet is offline
 
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Location: Hillsboro, OR
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The three 12 projects I've done have not been primed other than where the plans specifically call out primer. These specific call-outs mostly regard parts formed from other aluminum alloys.
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  #10  
Old 11-02-2014, 01:30 PM
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Rick_A Rick_A is offline
 
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Quote:
Originally Posted by waterboy2110 View Post
... Personally - I've found that it at least adds 33% to the build plus the weight ...
I'm priming everything with AZKO and I'm sure it has added at least 33% to my build time. However, I also plan on selling the -12 that I'm building soon after I get the flight testing done. I think having a fully primed interior will add value for a potential buyer living in a humid or coastal environment.

If nothing else, the AZKO green looks really cool.
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