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Corrosion Protection with Stainless Fasteners

Posted By:
John Ker
Homebuilder or Craftsman
#1 Posted: 9/16/2010 07:48:59 Modified: 9/16/2010 10:29:29

 Hi Group,




I am looking for an anti-corrosion jointing compound/ sealer for wet rivet assembly for my homebuilt project. The favourite material amongst other builders is the product "Mastinox 6856K" fromPPG / PRC-Desoto International. Problem is, this is military spec and only seems available to industry but not to general public.


I am in Germany and have tried to find suppliers without success.

Has anyone experience of the Mastinox product, or know of a good alternative?
  • Are there online suppliers for the private non-industry use? (Tried the usual suspects like A/C Spruce, Wicks)

  • Some background info: I am located in Bavaria, and building a Platzer Kiebitz biplane in an old barn. The structure is AlCuMg1 (2017) Aluminium tubing/sheet with stainless steel rivets, hence the efforts in protecting against galvanic corrosion. I already have a two component epoxy wash primer with zinc-chromate basis, but still need a good jointing compound.

    John Ker

    EAA 1005754


    Joanne Palmer
    Young Eagles Pilot or VolunteerHomebuilder or Craftsman
    #2 Posted: 9/16/2010 10:51:21 Modified: 9/16/2010 10:54:00

    Mastinox might be available from AVIALL but it will be pricey.


    You could aslo use Proseal 890 which is sold by Aircraft Spruce as a fuel tank sealant. 


     But if all you need is corrosion protection for rivets you can also use MIL-PRF-23377 primer also sold by Spruce.



    Of the three: Mastinox, Sealant and Primer, Primer is easiest to use and is about as effective unless you're right next to an industrial plant or the ocean.  All you do is mix up a small amount (5CC or so) and then using a Q-Tip swab the hole just before you insert and set the rivet while the primer is still "wet".   5CC should do about all the rivets you can set in the time it takes for it to go off.