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-   -   Anyone regret not priming? (https://vansairforce.net/community/showthread.php?t=146531)

Roy25101 02-09-2017 10:48 AM

Anyone regret not priming?
 
I figure these aircraft have been in existence long enough that perhaps someone might have some regret not priming while building. I've been through the linty of information on why or why not but do not recall anyone specifically having any issues with the "not". Perhaps I missed it.

In advance, thank y'all for the information.

P.S. For the parts that are not Al-clad and require priming these 2k two part epoxy primers in a rattle can are fantastic. Take care.

rv8ch 02-09-2017 01:17 PM

Quote:

Originally Posted by Roy25101 (Post 1148755)
...
P.S. For the parts that are not Al-clad and require priming these 2k two part epoxy primers in a rattle can are fantastic. Take care.

please tell me more about this product? Sounds really cool...

shanecfi 02-09-2017 01:28 PM

Primer
 
I think he means this...........http://www.eastwood.com/eastwood-s-2...imer-gray.html


Maybe?

Carl Froehlich 02-09-2017 01:55 PM

Quote:

Originally Posted by Roy25101 (Post 1148755)
I figure these aircraft have been in existence long enough that perhaps someone might have some regret not priming while building. I've been through the linty of information on why or why not but do not recall anyone specifically having any issues with the "not". Perhaps I missed it.
.

Hard to prove a negative. I suggest you go to any FBO and ask how often they do CorrosionX treatments.

The guy I sold my RV-10 to is a long time spam can pilot. One of the first questions he asked me was "when was the last time you applied CorrosionX?". I explained to him that one applies CorrosionX on airplanes not properly protected from corrosion during construction.

Prime - you and the people that fly your plane after you will be happier.

Carl

Mark Albery 02-09-2017 02:07 PM

I've used a few of the 2K epoxy primer cans. They go on quite nicely, but you only have about 2 days to use the can once activated.

Mach.26 02-09-2017 02:30 PM

Quote:

Originally Posted by rv8ch (Post 1148800)
please tell me more about this product? Sounds really cool...

I was intrigued to until I saw the price and the fact that the pot life is only 48 hours once you "activate" the spray. :eek:

rv7boy 02-09-2017 03:13 PM

Risk decision
 
My 1969 C172 had the CorrosionX treatment a couple of years ago due to very light corrosion from wing root insulation that got wet during a storm at Oshkosh. If it had not gotten wet I'm convinced it STILL would be corrosion free. In the build of my RV7, I'm not priming the Alclad. I'm 68 years old. If I finish my RV in a couple of years, I figure I should be about 116 years old before I start worrying about corrosion. :eek:

David Paule 02-09-2017 03:23 PM

My 62 year old certified airplane isn't primed. It's lived most of its life in the dry states like Colorado. The only corrosion it's ever picked up was due to six months tied down outside of Philadelphia. The thee years it was in a hangar on the west coast, three miles from the beach, did nothing.

That said, I'm priming my RV-3B -- for ease of selling it eventually. But that's the only reason.

Dave
RV-3B now on the fuselage

rongawer 02-10-2017 09:38 AM

Old and Tried
 
Quote:

Originally Posted by David Paule (Post 1148833)
My 62 year old certified airplane isn't primed. It's lived most of its life in the dry states like Colorado. The only corrosion it's ever picked up was due to six months tied down outside of Philadelphia. The thee years it was in a hangar on the west coast, three miles from the beach, did nothing.

I agree with this. My '61 Debonair had no primer inside and no corrosion up until 2012 when we parted ways. An argument could be made that Beechcraft started using primer on the interiors of it's aircraft in the late 60's, and therefore, if it was the right thing for Beech, it should be right for me.:rolleyes:

I imagine the primer debate will continue in perpetuity and I simply have my opinion, which is that for the internal structures, I don't use primer and instead use a product like Corrosion X after the build, and then re-spray every one to three years (depending on your climate), which will provide active corrosion protection rather than relying on the passivation that primer by itself brings.

The big advantage of an anti-corrosion spray is that if you did NOT prime the interior of the airplane, or you bought an airplane without primer, you can still provide corrosion protection after the build.

Here's the thing, even though my certified airplane was primed, I still spray it internally every two years. It takes me 1-2 hours to do and uses a little over a quart of the stuff to do the whole airplane, and the stuff gets into everywhere. If you have corrosion or a loose rivet, you will soon know where it is, as the CorrosionX will provide a dirty streak out of wherever the corrosion was. The full benefits and description are available on their website, but I will add that it does a great job of keeping the interior parts shiny, stops corrosion in progress and presents further corrosion - it's main purpose. If weight is an issue, this is a lot lighter than primer (an RV-12 only needs about a pint of this stuff).

It does have it's minor drawbacks, which are - if you spray everything down FWF with the cowling off, better have a pan under the airplane as all gook and corrosion will come off and drip to the floor. And you shouldn't use it within six months of painting, as paint will not adhere to it and it will penetrate and then come out of every imaginable spot and it works through rivets and bolts. As an aside, it's really good at making the engine bright and shiny and is recommended for electrical components as well.

In direct response to OP question, I do not regret not priming the interior of my airframe. I did not prime the wings, control surfaces or fuselage of my aircraft, except where it was called for in the directions - generally only where non-alclad parts were joined, and certainly all ferrous parts.

BillL 02-10-2017 12:40 PM

Quote:

Originally Posted by Mach.26 (Post 1148814)
I was intrigued to until I saw the price and the fact that the pot life is only 48 hours once you "activate" the spray. :eek:

If you want a primer that will prevent corrosion, there are zinc chromate spray cans in lots of colors. https://www.google.com/#q=skygeek+zinc+chromate+spray

There are several reasons for primers, adhesion promoter, base coat compatible with top coats, and corrosion protection (zinc or strontium chromate)

Many fill the first 2, some the third and a few all three. Azko has more paints than ford makes cars, but the popular version noted frequently here fills all three.

So, the rattle cans above are good for small parts that will not get a top coat and don't need to look pretty, or resist acetone after dry. Like contact surfaces inside the HS.


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