SB-4400 EZ Perma-Seal® is a solvent-based silane/siloxane invisible penetrating sealer. It is recommended for outdoor use, on old and new, horizontal or vertical surfaces. SB-4400 EZ can be applied immediately after most surface installations, as it is breathable and will not trap naturally occurring moisture or efflorescence. On new concrete, SB-4400 EZ should be applied once concrete is fully cured (30 days after installation). SB-4400 EZ protects surfaces from water penetration and salt damage from the use of de-icers or exposure to salt air. Due to its superior water repellency, SB-4400 EZ helps to reduce biological growth such as mold, moss and algae. SB-4400 EZ has the consistency of water, is clear when applied and dries transparent on most surfaces. Some surfaces may darken slightly. Cured sealer is freeze resistant to -60°F (-51°C) and is stable up to a temperature of 180°F (82°C).