I'd invest in a preservative! If your FSG got to the point that it smelled off and had flecks, there were probably things growing in it long before that. I know that my first batch, with no preservatives, smelled off after 3 days at about 62 degrees.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08

SE PA

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic (now Hello Curly Curl Stimulater); Botanical Spirits Jellies, CJ Repair Me, Marie Dean Leave Ins and Curl Creams