Vp900.77 Fire Retardant Polyurethane Sanding Sealer

In the event of a fire, the product expands volumetrically upon contact with flame, forming a swollen layer. It allows reapplication after the deformed surface is scraped off with a spatula and sanded. To ensure the validity of the fire-retardant certification, the substrate must be fire-resistant MDF and used in combination with VP900.77 Fire Retardant PU Sealer and VP900.25 Fire Retardant PU Special Matt Varnish.