Great tip!!! Thanks so much for your post - I will definitely try this stuff out

Btw, I directly compared an SFS lace front purchased in 2007 with one purchased in 2008 over the period of 3 months. The one from 2007 looked like new after the three months and hadn't frayed at all. The 2008 system had frayed a lot more after just 1 month, and after 3 months it was very frayed. I don't think I treated the systems any differently... but the lace looked slightly different so perhaps it was a different type of SFS. Both were equally undetectable.