Bill Freeman wrote:

 Urethane cast onto the leading edge works great for rain
protection.  I don't even throttle back, normally running 2525
in cruise, get a bit of roughening at the outboard 6 ", and it
takes the tip paint RIGHT off.  Make the foil with a 1/4 -3/8"
wide blunt LE, drill a row of 1/16" holes into the LE, make a
alum foil mold, mix up the urethane, bond in place and shape
into a leading edge.

 
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