VP900.77 Fire Retardant PU Sealer

The product enlarges by volume while in contact with fire. By spatula residues can be removed from deformed surface and new application can be done after sanding. Certificate of fire retardant will be valid only if fire resistant MDF, VP900.77 Fire Retardant Polyurethane Sealer and VP900.25 Fire Retardant Polyurethane Matt Varnish applied together.