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  #21  
Old 10-23-2017, 05:38 PM
gasman gasman is offline
 
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Location: Sonoma County
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"Powdercoating is a barrier coating. Once the barrier is chipped or damaged corrosion can run under the powder coating unless the metal substrate is properly passivated."

"The coating on one of them has blown and on removing there's light corrosion across at least half the horn. The other horn looks like it's bubbling."


Keep in mind your motor mount is also powder coated. Corrosion can happen under the coating without showing on the surface like paint.
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  #22  
Old 10-23-2017, 05:52 PM
KatanaPilot KatanaPilot is offline
 
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Location: Locust Grove, GA
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Quote:
Originally Posted by Chrisran75 View Post
Just stumbled across this having pulled my elevator horns for an RV7 off the shelf this evening....
The coating on one of them has blown and on removing there's light corrosion across at least half the horn. The other horn looks like it's bubbling. I received the empennage kit earlier this year. Guess I'll have to find a local powder coater who's willing to do these for me
The bad news is you have some failure of the powder coating. The good news is you found out before the horns were riveted to the elevator. My luck wasn't as good...

And my RV-10 elevators are complete also. Hopefully the powder coat folks did a better job on those.
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  #23  
Old 10-23-2017, 06:22 PM
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johnbright johnbright is offline
 
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Default what's wrong with paint?

Quote:
Originally Posted by Chrisran75 View Post
.... Guess I'll have to find a local powder coater who's willing to do these for me
Is there a reason they can't be painted versus powder coat?
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  #24  
Old 10-23-2017, 07:46 PM
Captain Avgas Captain Avgas is offline
 
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Quote:
Originally Posted by KatanaPilot View Post
The bad news is you have some failure of the powder coating. The good news is you found out before the horns were riveted to the elevator. My luck wasn't as good...
And think of all of the RV builders who have used Sikaflex to adhere their plexiglass canopies to Vans dodgy powder coated canopy frames. Vans have always advised against the Sikaflex process. They probably knew something that the Sikaflex beta tester/builders did not.
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  #25  
Old 10-23-2017, 08:42 PM
VA Maule VA Maule is offline
 
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Default Paint

johnbright: To answer your question there is absolutely nothing wrong with paint as long as the preparation and paint type is appropriate to the purpose. I do know I prefer paint it will not hide rust it shows and is easily spotted and easily repaired, powder coated on the other hand produces a very good looking finish but can have a poor bond and conceal rust until failure of the part . I have experienced this several times with light weight components on heavy equipment over the years ( retired contractor ) . With that said I have found the quality of the powder coated parts in my 8 kit to be quite satisfactory, but I will be riveting my canopy to the frame even though sikaflex looks so clean and nice in this structural area secure attachment is paramount.
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