This invention relates to a coating composition for a fertilizer comprising at least 50 wt % of a cross-linked lipid; and less than 0.20 wt %, relative to the total weight of the lipid, of a catalyst for cross-linking an unsaturated lipid. The cross-linked lipid has a viscosity at 20 degree Celsius (° C.) in the range of 110 and 800 mPa·s.