• View all Rainguard Brands
  • Blok-Lok™ Siloxane Water Repellent

    • Penetrating formula for vertical porous surfaces
    • Dries with a natural finish that will not yellow
    • Protects against water intrusion, efflorescence, lime, spalling, freeze/thaw damage, stains, mold, mildew, and UV damage
    • Zero VOC, eco-friendly, water-based, & made in USA
    BLOK-LOK™ 5 Yr Material Warranty

    Select sizes & view technical information below

    Product Overview  |  Technical Data
    Coverage Rates  |  Application Guidelines

    Item #: CR-0607
    6 Oz Super Concentrate
    Makes 1 Gallon

    6 Oz Super Concentrate

    Item #: CR-0608
    32 Oz
    Super Concentrate
    Makes 5 Gallons

    32 Oz Super Concentrate

    Item #: CR-0601
    1 Gallon Concentrate
    Makes 10 Gallons

    1 Gal Concentrate

    Item #: CR-0605
    5 Gallon Concentrate
    Makes 50 Gallons

    5 Gal Concentrate

    Item #: CR-0200DR
    55 Gallons
    Ready to Use

    55 Gal Drum

    Item #: CR-0201
    1 Gallon
    Ready to Use

    1 Gal Ready-to-Use

    Item #: CR-0205
    5 Gallons
    Ready to Use

    5 Gal Ready-to-Use

    32oz Value Pack
    $700.68 $467.12
    Buy 4 Get 2 Free
    33% off regular price (each)

    32 Oz Super Concentrate Value Pack Buy 4 Get 2 Free

    1 Gallon Value Pack
    $896.00 $672.00
    25% off regular price

    Gallon Concentrate Value Pack Buy 3 Get 1 Free

    Blok-Lok ™ sets the industry benchmark for siloxane water repellent protection. Designed to protect exterior vertical surfaces in the harshest of climates. Blok-Lok™ is formulated with siloxanes, creating a long chain water repellent barrier deep within the masonry surface.

    View Technical Documents


    • 100% breathable water repellent for vertical concrete, brick and masonry surfaces
    • Excellent resistance to water, salt spray and wind driven rain
    • With no masking or taping required and clean up with only soap and water
    • More days a year to apply – cold weather application down to 40°F (4.4°C)
    • Eliminates wait time for new concrete to cure – apply within 48 hours of pour
    • Does not alter surface appearance – leaves no film, sheen and will not yellow
    • Mold and mildew inhibitor – stops growth dead in its tracks
    • Backed by a FIVE year material warranty

    Coverage Rates (Theoretical)

    Substrate Sq Ft / Gallon # Of Coats*
    CMU Block 60-80 2
    Clay Brick 125-150 2
    Stucco 100-150 1
    Dense Masonry Surfaces 125-150 1
    Wood 150-200 1
    Clay Block 50-60 1
    EFIS 80-120 1
    Concrete Curing 250 1

    *Please refer to the Technical Data Sheet below for full application guidelines. If you have further questions, please give us a call at (888) 765-7070

    How to Use

    1) Prepare Surface

    To apply, surface moisture content must be less than 25% as measured with an electronic moisture meter. Surfaces must be free of dirt, grime, efflorescence, lime run, construction debris, form oils and release agents, chalked materials, loose and peeling paint, mold, mildew, etc. All cracks should be pointed or caulked.

    Do not apply if rain, snow, or temperatures below 40°F are expected within 48 hours. Do not apply if relative humidity is greater than 80%.

    2) Dilute (If Concentrate)

    Mix with 9 parts water & 1 part product (9:1 Mix Ratio)

    3) Apply Blok-Lok ™

    Apply Blok-Lok™ with low-pressure airless spray equipment. Use a spray tip size of .031 to .055. Hold spray head 8 to 12 inches from the surface. Multiple coats may be applied, yellowing will not occur. Blok-Lok™ dries in 1 hour and fully cures in 5 to 7 days.


    Technical Documents



    You may also like…