No .... knots can become undone on any system...the `looseness` of knots on a freestyle is minimal compared to a `set`style. Hair swells when wet so even tighter knots can become loose and can become undone over time . Knot sealer just applies an acrylic layer across the base [lace] and helps hold the hairs in place....some wearers don`t bother with it and apparently have no issues with shedding..... I`ve always used it `just in case`.