Fast Trak Hair Knot & Tape SealerThis is a great product for sealing your knots on your lace hair system. This product will aid in proventing your hair system from shedding hair due to loose knots. Directions:Clean hair system thoroughly. Spray sealer on the inside of the base and dry with warm hair-dryer. Recommended each time system is serviced. For the first time on a new system, apply 3-4 times. I have completed researching this product and find it very beneficial in saving your hair system from typical shedding that happens with all lace hair systems.