George, and others with experience not just opinions -- I was recently told by a bowyer I respect that ff will not harm wood bows, whether self or wood lams, which I mostly build. I would think otherwise, since it has less stretch, thus imparts or allows more of the shock of each shot to be absorbed by the bow. But I swear, ff makes a lot more difference in speed and all-around shooting satisfaction on my wood bows than I notice on my custom glass bows. I've always used B50 and been happy with it. I'm just curious. Again, the quetion to those who know is: will ff harm all wood bows? Thanks for your advice.