Mesh units are made by hair being tied to a mesh in a specific way. When those knots get loose the hair goes flat and it becomes hard to style the unit and hair starts to fall out. Top-Loc Knot Sealer is designed to prevent both of these things. Spray on the inside of mesh units after each take down to seal and protect those delicate knots. This will reduce shedding, and extend the life of your hair system. Our alcohol-based formula is low odor so you can use indoors unlike our competitors. Extends the life of the hair systems