Welp, 2025 alloy and 7075 alloy, two of the alloys of aluminum props,
develop intergranular corrosion and die if the passivating layer of
chromic
acid conversion and paint are not left on the prop. But I guess if it is
polished every day . . .

"Welp"? How'd THAT get past your chell-specker?

Anyway, of COURSE the very first flight we took with the polished prop was
to Door County -- where the plane literally spent 60 hours sitting outside
in the rain. (We don't even use water to WASH the plane, for gosh-sakes,
and then we immerse the bare aluminum in a shower for two days...)

Well, I'm happy to say that the Simichrome polish we used on the prop
apparently leaves some kind of a protective coating on the metal, because no
corrosion was evident when we returned. We gave it a light polishing when
we parked Atlas in the hangar, and the prop still looks GREAT.

(We actually had two line-guys on this trip comment on how good it looked!

--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"