The International Cessna^® 170 Association

I've been cleaning out the interior this summer, removed the old headliner,insulation and all the different types of glue used for various types of insulation used over the years. I found corrosion on the rear bulkhead ( back of baggage area ) across the upper half where insulation had been glued on. what is the best method of cleaning it up in preporation for some protective paint?
Scott 53 B

cmsusllc wrote:I've been cleaning out the interior this summer, removed the old headliner,insulation and all the different types of glue used for various types of insulation used over the years. I found corrosion on the rear bulkhead ( back of baggage area ) across the upper half where insulation had been glued on. what is the best method of cleaning it up in preporation for some protective paint?
Scott 53 B

Sand all the heavy stuff away, clean with alumi-prep 33, coat with alidine, paint with a good epoxy primer....Ilike DP-40 from PPG.....Brad

I don't think sand was what Brad meant but probably was thinking a mechanical medium such as Scotch-Brite with Alumi prep and water to remove oxidation. (I use MEK to remove old glue ( wear PPE and ventilate the area)). After clean-up you can assess damage. I also like PPG's line of epoxy primers, no need to paint afterwards.

I've been using a scotch-brite type disc on my die grinder to remove corrosion on my 170. If I recall correctly the limit is 10% of the skin thickness for the max. that can be removed without having to replace or repair the corroded metal. I'd be reluctant to use Alumni-prep on the airplane's interior structure as it is an etching acid. If the area this comes in contact with can't be completely rinsed off it will cause corrosion. Areas between bulkheads and skins are especially difficult to rinse completely clean. In this index are two good sets of articles on removing corrosion written by Dennis Wolter of Air-Mod: http://www.airmod.com/articles/index.htm

c170b53 wrote:I don't think sand was what Brad meant but probably was thinking a mechanical medium such as Scotch-Brite with Alumi prep and water to remove oxidation. (I use MEK to remove old glue ( wear PPE and ventilate the area)). After clean-up you can assess damage. I also like PPG's line of epoxy primers, no need to paint afterwards.

Nice ketch Jim, that is exactly what I meant....Brad

Ill suggest using pads, the motive force of your mitts is unlikely to inadvertently overheat the metal.

Thanks everyone. Basically this is the direction I was going but with more specific information.
Scott