5 GAL Armor SC25 Penetrating Concrete Sealer and Water Repellent Salt Guard Excellent professional grade breathable water based Siliconate water repellent sealer for unsealed concrete surfaces. Minimizes damage due to water and salt water from de-icing road salts and salt water pool systems. Reduces cracking, spalling, and pitting caused by water absorption and road salts. Will not change the color of the concrete, will not leave behind a slippery surface film Long lasting, easy to apply, requires only 1 heavy coat every 7-10 years! 5 gallons covers up to 875 FT2.