Thanks Thanks:  0
Results 1 to 18 of 18

Thread: Too paint or not to paint

  1. #1
    algonquin's Avatar
    Join Date
    Apr 2013
    Location
    Seldovia,Ak
    Posts
    1,064
    Post Thanks / Like

    Too paint or not to paint

    What do you guys do before covering you controls surfaces? Primer, paint or just leave it as it is. Thanks guys about to cover a set of flaps I just built .

  2. #2
    Hardtailjohn's Avatar
    Join Date
    Jan 2007
    Location
    Marion, MT
    Posts
    842
    Post Thanks / Like
    Good epoxy primer and I tend to use a topcoat too...but some epoxy primers are also a sealer too...in that case you don't need to paint.

  3. #3
    skipster's Avatar
    Join Date
    Oct 2008
    Location
    Altamont NY
    Posts
    203
    Post Thanks / Like
    If you're talking ailerons I don't paint them. Just the short piece of steel tubing on the trailing edge.

  4. #4
    mike mcs repair's Avatar
    Join Date
    Aug 2004
    Location
    chugiak AK
    Posts
    11,774
    Post Thanks / Like
    I just cover them....

    but since you are by saltwater(Seldovia?).. then you might prime them...(use a good 2 part epoxy primer)

  5. #5

    Join Date
    Jun 2002
    Location
    NC
    Posts
    402
    Post Thanks / Like
    I have been thinking that you would need to epoxy prime any area where you use glue to attach fabric. Ceconite and Poly-Fiber require this on new metal… other covering systems may require priming of these areas also.

    What is the consensus about this?

  6. #6
    RaisedByWolves's Avatar
    Join Date
    Feb 2005
    Posts
    4,349
    Post Thanks / Like
    I like to prime and top coat steel parts.

  7. #7
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    20,532
    Post Thanks / Like
    Wasn't aware of any requirement to top coat aluminum prior to covering. After treating the surface corrosion on the aluminum parts of my Clipper wings I epoxy primed them. I don't usually prime new aluminum parts unless the customer requests it. I have found lots of corroded aluminum when uncovering over the years. The steel definitely needs attention. I blast, epoxy prime and top coat with catalyzed polyurethane. Here is a thread with some sobering pictures.
    http://www.shortwingpipers.org/forum...n-thread/page2
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
    Likes Goodolboy liked this post

  8. #8

    Join Date
    Dec 2006
    Location
    Meanwhile,...
    Posts
    5,369
    Post Thanks / Like
    Quote Originally Posted by Jasperfield View Post
    Ceconite and Poly-Fiber require this on new metal
    Source?
    Remember, These are the Good old Days!

  9. #9

    Join Date
    Jun 2002
    Location
    NC
    Posts
    402
    Post Thanks / Like
    Quote Originally Posted by OLDCROWE View Post
    Source?
    Poly-Fiber Procedure Manual No. 1. Revision 21, September 2006: Ch. 2 - Airframe Preparation: New Aluminum. page 11.

    Ceconite Procedure Manual 101, June 2008 Revision, Ch. 2 - Airframe Preparation: New Aluminum, pages 10-11.

    Star Gloss Procedure Manual, May 2010, Ch. 2 Airframe Preparation: New Aluminum, page 8.

    For all applications of glue, on new aluminum, the respective STCs require: Cleaning of the new aluminum; one of the following as specified: conversion coating wash or Alodine wash; and application of Epoxy Primer.

  10. #10
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    20,532
    Post Thanks / Like
    Quote Originally Posted by Jasperfield View Post
    Poly-Fiber Procedure Manual No. 1. Revision 21, September 2006: Ch. 2 - Airframe Preparation: New Aluminum. page 11.

    Ceconite Procedure Manual 101, June 2008 Revision, Ch. 2 - Airframe Preparation: New Aluminum, pages 10-11.

    Star Gloss Procedure Manual, May 2010, Ch. 2 Airframe Preparation: New Aluminum, page 8.

    For all applications of glue, on new aluminum, the respective STCs require: Cleaning of the new aluminum; one of the following as specified: conversion coating wash or Alodine wash; and application of Epoxy Primer.
    Wow, looks like I gotta do some reading.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  11. #11
    algonquin's Avatar
    Join Date
    Apr 2013
    Location
    Seldovia,Ak
    Posts
    1,064
    Post Thanks / Like
    Thank you everybody, this is a great place to go for help. I'll primer and paint everything. Easier than redoing thing a few years down the road.

  12. #12
    Steve's Aircraft (Brian)'s Avatar
    Join Date
    Aug 2004
    Location
    White City, Oregon
    Posts
    939
    Post Thanks / Like
    Quote Originally Posted by Steve Pierce View Post
    Wow, looks like I gotta do some reading.
    You and me both Steve...

  13. #13
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    20,532
    Post Thanks / Like
    Revision 21: Page 11 of the Polyfiber manual says under 2. Airframe Preparation, New Aluminum, "Prime with epoxy primer. See directions in the paragraph above on Old Aluminum."

    Under Old Aluminum it says: "Old aluminum must now be acid etched, treated with a conversion coating and then primed for best results."

    I guess it is open to interpretation. I think epoxy priming is good but have removed most all systems from lots of airplanes I have yet to see a problem with the fabric adhering. I have seen isolated incidents of corrosion.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  14. #14
    cubpilot2's Avatar
    Join Date
    May 2003
    Location
    Anchorage Alaska
    Posts
    804
    Post Thanks / Like
    Quote Originally Posted by Steve Pierce View Post
    Revision 21: Page 11 of the Polyfiber manual says under 2. Airframe Preparation, New Aluminum, "Prime with epoxy primer. See directions in the paragraph above on Old Aluminum."

    Under Old Aluminum it says: "Old aluminum must now be acid etched, treated with a conversion coating and then primed for best results."

    I guess it is open to interpretation. I think epoxy priming is good but have removed most all systems from lots of airplanes I have yet to see a problem with the fabric adhering. I have seen isolated incidents of corrosion.

    I agree that this is definately open to interpretation and I can't see anyone getting into hot water for covering over bare aluminum if they so choose.

    In my opinion the Revision 21 manual was developed to guide inexperienced people through the process of restoring an airframe prior to covering. Their manual uses several "non-binding words on page 11 and elsewhere such as "primed for best results" and "We recommend using EP-420 white epoxy primer over aluminum." They do a good job of guiding people from using products that will cause problems, but the STC is only for the installation / use of Polyfiber fabric on the airframe.

    The STC is not the final authority in how the airframe preparation is done. There are plenty of other guiding FAA and manufactures documents for that.

    Polyfiber Epoxy primer is a very good product and should be considered a "best practice" in most cases, but I don't see where they can mandate it to be used over all aluminum surfaces.

    Their manual also treats the preparation of steel tubing in a similar manner by referencing only the use of Epoxy primer. If this is a literal mandate for surface preparation then they have just outlawed the usage of Powder coated steel structures, (unless you want to prime over it).

    How many people do that?
    Ed

  15. #15

    Join Date
    Sep 2003
    Posts
    7,353
    Post Thanks / Like
    They can do anything the feds approve, but that does not mean older STCs are revoked. Just keep on using your older procedure manual.

    Opinion.

    Also the opinion of my FSDO last time I checked, which was a while ago.

    My experience is that a well cared - for Cub wing or aileron will show no corrosion, even if parked outside, so long as it is flown regularly. Let continuous moisture in there, and you can have a pile of gray powder. Mine got shot with a haze coat of zinc chromate in 1969, but I have seen others that were bare in good shape.

  16. #16

    Join Date
    May 2008
    Location
    Upper Peninsula of Michigan
    Posts
    587
    Post Thanks / Like
    My PA11 EX project is primed with Macropoxy. It is a marine epoxy from sherwin williams. I think it is a sealer as well by looking at the applications....anybody ever use this stuff? or g=have experience. I was thinking of top coating, but I don't think it's necessary.
    http://protective.sherwin-williams.c...3Aproduct-6841

  17. #17

    Join Date
    Feb 2002
    Location
    Alaska/NE Washington
    Posts
    364
    Post Thanks / Like
    The worst examples of aluminum corrosion under fabric I've seen were under the Blue River process. However this is ancient history.

  18. #18
    mvivion's Avatar
    Join Date
    Jun 2003
    Location
    Bozeman,MT
    Posts
    11,343
    Post Thanks / Like
    Back to the original question: Where is your Cub going to spend the next 25+ years? In what environment, doing what sort of operations?

    If the answer is "I don't know." then I'd suggest corrosion proofing is a great idea. Maybe the next owner will put the thing on floats, and operate it in the bayous of LA.

    Do do him or her (and yourself) a favor and treat that metal for worst case use.

    MTV

Similar Threads

  1. New paint job
    By Lasater in forum Cafe Supercub
    Replies: 17
    Last Post: 01-13-2016, 10:14 PM
  2. Pod Paint
    By behindpropellers in forum Tips and Tricks
    Replies: 6
    Last Post: 05-06-2009, 06:35 AM
  3. paint respirators for aircraft paint
    By rowcropper in forum Products, Purchases, Reviews & Prices
    Replies: 7
    Last Post: 07-23-2005, 08:54 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •