Rex NF Sisu Hard Black Liquid is a durable, high-performance liquid glide wax designed for use as a base layer beneath other liquid waxes or melt-on waxes, especially in new snow conditions. Formulated to provide excellent anti-static properties and long-lasting glide, this fast-drying liquid creates a smooth, friction-reducing layer that enhances speed and control. Ideal for race-day tuning or everyday skiing, it delivers reliable performance without the need for ironing.