The Aymar-Demuth prop on my RV-6 (likely made around 2002) came with some kind of epoxy filled leading edge. In spots where the paint has come off a little bit, the epoxy underneath looks gray.... like it might be J-B Weld or Marine-Tex.
I still avoid flying in rain with it. On the way to Oshkosh, I had no choice but to fly thru some amounts of very light rain, but I reduced the RPMs to about 2000 and the prop handled that just fine without any visible signs of rain erosion.
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Neal Howard
Airplaneless once again...
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