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General Tech Permatex aviation

I consider it good for those areas. Some people say that it hardens over time. However, I have never experienced that.

Hylomar is also good for those joints. If you want to save some money over Hylomar, Permatex makes a Hylomar Blue copy, Permatex 85420 (Permashield). I have used that on oil pans and timing covers.
 
I've used Permatex Aviation sealer for years and would not hesitate to use for most applications today. However, I am lately pretty much convinced that the Hylomar sealants even better.
Tom
 
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