Gidday all,
Just spent the last few hours trying various grades of wet and dry sandpaper
to remove the oxydisation and some old pen marks from my rudder hinges prior
to metal parts treatment. I specifically used a water soluble marker to make
this process easier in the future, and boy was I dissapointed when I tried
to wash it off! Water/Acetone/Turps, nup, nothing worked. So out with the
sandpaper.My question is:"will the Alumiprep/Iridite/or Deoxydine products
will actually remove this without the elbow grease? Am I wasting my time?
What I have noticed is that the buildup of oxydisation on these components
is significant. Having no experience with aluminium preparation before, I
originally thought the hinges looked in not bad condition. The airline spec
I am using mentions a cleanliness check which has been mentioned on other
occasions in this forum, called the water break free check. For anyone not
familiar with this term it states: "Stand item with the surface to be tested
approximately in the vertical position. Flood area with water. Stop the flow
of water. The film of water should not break or retreat from any part of the
surface for 30 seconds after the flow of water has ceased."
This water break-free check I feel sure would fail without either polishing
the hinges with finer and finer grades of sandpaper, or a chemical treatment.
Any advice would be greatly appreciated!
Newton's Third Law of Motion is playing havoc with my fingertips on the
sandpaper.
Regards
Tony Renshaw
Builder No.236
The Aussie Connection.
|