The best brick chimney sealer to use on exterior brick and mortar is a penetrating water repellent sealer. Water repellent sealers will chemically react within the pores of the brick and mortar to form an invisible hydrophobic barrier that can't be seen or felt from the surface. Water repellent sealers can provide up to 10 years of protection against deterioration caused by water absorption, freeze-thaw cycles and salt. They can also reduce the growth of mold and mildew, as well as the formation of efflorescence.

When it comes to choosing a brick chimney sealer you have a few options. The first is a water based Siliconate, like the Armor SC25. This type of water repellent requires only one coat and is considered to be a cost effective option to sealing brick. A second option is a solvent (or water based) Silane-Siloxane water repellent, like the Armor SX5000. Silane-Siloxane blend sealers are better options than using a Silane or Siloxane along because the combination sealer eliminates the weaknesses and takes the strengths. A Silane-Siloxane combination sealer will give the best protection above and below the surface. This type of sealer is used a lot in DOT applications to seal roadways and bridge decks. Which water repellent is best for your application will depend on your budget (Siliconate water repellents like the Armor SC25 are more cost effective), and your preference (the Armor SX5000 is DOT approved, high solids).


Armor SX5000 Penetrating Silane Siloxane Concrete Sealer and Masonry Water Repellent (5 GAL)

Armor AR350 Solvent Based Acrylic Wet Look Concrete Sealer and Paver Sealer (5 GAL)

Armor AR500 Solvent Based Wet Look High Gloss Acrylic Concrete Sealer and Paver Sealer (5 GAL)

Armor UTN60 Oil and Gas Resistant Aliphatic Urethane Concrete Floor Coating

5 GAL Armor S2000 Concentrated Sodium Silicate Concrete Densifier Sealer and Surface Hardener

Armor SC25 Siliconate Water Repellent Concrete Sealer with Salt Guard (1 GAL)