A spray-on liquid sealer that forms a barrier to seal hairline cracks and protect concrete against water penetration, PENESEAL PRO creates a sub-surface gel that seals the pores, capillaries and cracks. The product remains active as long as water is present, sealing any future hairline cracks. Because of its ability to withstand thermal stress, PENESEAL PRO is ideal for concrete roofs, roof parking, podium decks, bridge decks, terraces, traffic bearing structures, runways and driveways.