I agree with PD. Overlays on anything but osage, if you must use it.
But I am not an expert on FF because I once had a mishap with the stuff and now refuse to use it. Y'all are welcome to it.
I admit I've used it for tillering osage. It's good in the early stages because it does not stretch much.
I made the mistake of trying to use it on a red oak bow and had the nock split for 6 inches. String broke when stringing. I'm glasd I was not drawing it. FF was unpadded.
I know. I know... the mishap was my fault and not that of the string material. Despite the fact that I've made hundreds of bows and never had a bow's self nock split with B 50. I've also never ever broken a B 50 string though I did come close once.
Did you ever notice on archery internet sites of there is a problem with FF it's the bowyer's fault?
Ok...I'm feeling a bit on the irascible side today 'cause its nap time.
Let me get this straight. FF is ok as long as you pad the loops with B 50 and put on overlays on anything but osage.
Use it if you want but not everyone has had nothing but success with it. I know...my fault.
No thanks. Pass.
Jawge