Instarmac ProLevel Rapid Set Fibre Reinforced Flexible Floor Leveller is a single part, high strength, rapid drying and curing cementitious smoothing underlayment. The products formulation incorporates a blend of specially graded fillers, fine cements, polymers and fibres. The specially formulated fibre technology aids application and strength resulting in a strong, sound and even base ready to commence the tiling process after only 45 minutes.