Here is a synopsis of what it is supposed to do. I have not used my PE lines enough to know if it helps with fraying. Here is what I have found out when using it on all types of line. On ester it helps with manageability and as sated it puts a very thin film on the line which aids in casting distance. It does make it pretty slick. Of course ester line cast great anyway but this does make it better. It does same for mono and FC also. A little of this goes a long way. I use the PE Pro to spray on a new spool of line and let it sit overnight before putting on the reel. And when heading up the road for a fishing trip I will hit the reels up with a small spritz. It has worked out great for me.