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Old 02-13-2020, 04:56 PM
wirejock's Avatar
wirejock wirejock is offline
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,909
Default Alodine

If I build another, I'll look for a company that will alodine. I'll take all the blue vinyl off and have the whole thing alodined. Zero weight gain. Probably cost way too much though.
Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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Old 02-13-2020, 07:36 PM
Desert Rat Desert Rat is offline
Join Date: Aug 2018
Location: 50-50 Wichita KS & Scottsdale AZ
Posts: 309

R&B Aircraft Painting in Topeka KS advertises that part of their process is an acid etch and allover alodine treatment before primer.

No idea what it costs since that's still several years down the road for me, but there's a picture of an RV on the "process" page of their website where they mention it.
Terry Shortt
AGI, CFI, CFII, MEI, A&P, Janitor
RV7 Empennage & Wing done
Fuselage in process
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Old 02-18-2020, 10:54 AM
fixnflyguy fixnflyguy is offline
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,203
Default Alodine process outsource.. Why?

Alodine is about as easy as it gets, but really its primary function is a conversion coating for better topcoat adhesion. The acid etch process is an alternative to mechanical etch, IE Scotchbrite or similar. Ultimately, the most susceptible parts of our planes are the extrusions not able to take advantage of Alclad which is simply stated a pure aluminum, relatively non-corrosive layer applied to the sheet alloys. Alodine can be applied via cheesecloth/cotton rag wipe on, spray or submersion. Takes only a few minutes, and a good water rinse to be completed. A large plastic bag with a few ounces in it can be used to slosh around small pieces and such. All of my skins were alodined using cheese cloth an rubber gloves..we do it every day in the big jet overhaul world. There are even Alodine marker pens, similar to a big fat dry-erase that you can apply it with and no rinse is required. The skin edges, holes, and any extruded parts are the most important area of primer application while building if you want protection for eternity..that's where the corrosion will start.
Bill E.
8A7 / Advance NC
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Old 02-18-2020, 11:32 AM
RV7ForMe RV7ForMe is offline
Join Date: Jul 2015
Location: Europe
Posts: 599
Default I have the same problem...

I have had corrosion during the build process on "not started" material. Usually it starts like a hairline at the punched wholes.

That is why I have been in the "prime everything" camp. It sucks. I hate priming. It adds years!

I may try to just shoot the outside where things are riveted and leave the rest bare. I dont think it will corrode there. and if it does there is little harm. I can always shoot it from the outside. But I will never be able to get under the rivets unless I spray before assembly.

just my 2 cents.
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Old 02-18-2020, 12:27 PM
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fl-mike fl-mike is offline
Join Date: Jul 2005
Posts: 1,332

Originally Posted by rocketman1988 View Post
You mean it woul add a lot of time..

I primed only the inside of the skins and about every other part. It took tons of time. After some consideration, I can say that if I build again I probably would not prime. Do you want a 75 year aircraft or a 100 year aircraft?
But, at the same time, it is incredibly disheartening to find corrosion on your mint airplane a few years after getting it flying. There is a five year-old bare metal RV in a hangar near me that is COVERED with corrosion. I don't think the owner has seen it in a couple years, but in coastal areas, Alclad is not enough.

As others have said, a paint shop will strip the exterior back to bare metal, so if you are farming the final paint out, any exterior priming is for the build phase only.
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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