Cat whiskers can be bad for a string if not installed correctly...just recently it has been brought to our attention (thank you) a problem involving cat whiskers that some people prefer to tie themselves that can cause a string to wear prematurely at the tie on points.
Hopefully you can see in picture the premature wear due to the rubber sliding to one side of the string because of the string's ocsillation. The material used to tie the cat whisker on, was rubbing against the string each time it is shot fraying the string material. (I hope this makes sense) I took this picture before taking the string apart to further investigate.
Please make sure that when you tie cat whiskers on that the whiskers completely surround the string and protect it from abrasion and they are tied tightly but not too tight as to damage the string material.
Ryan (S2 Bowstrings) did a great video on how tie on cat whiskers.
I still prefer Hush Puppies or some kind of puffs (IMHO) to cat whiskers, they seem to be easier on the string, but to each their own.
Hope this helps everyone and in the future.
God Bless, Pierre