I just had to replace my rear prop two months ago due to FOD. Believe me, it is something you want to avoid., I got lucky and was off the hook for about $6000 total - probably more likely to be $8 to $10 thou. most of the time.
No teflon covering would have prevented the 3/4" gouge that was in my prop blade, although I'm sure they're a good idea for average small stuff like sand or perhaps tiny pebbles or stuff.
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