Micro-Seal® HD Silane / Siloxane Water Repellent
Penetrating Silane/Siloxane Technology
Ensures your project is protected from water intrusion, efflorescence, lime, spalling, freeze/thaw damage, stains, mold, mildew, and UV damage.
Natural Finish
Preserves the look of the building with a natural permeable finish and will not yellow.
Safe to use
Can be applied anywhere in North America because it contains Zero VOC, no carcinogens, no odor and can be applied on exterior surfaces and interior OEM environments.
Easy to apply
With a flood coat. Warranty up to 20 years.
Micro-Seal® HD Silane / Siloxane Water Repellent
Protect, restore and extend the life of your project with Micro-Seal® HD Clear Finish Silane / Siloxane Waterproof Coating. Made from the best water repellent chemicals in the construction market, Micro-Seal® HD is formulated by blending silanes and siloxanes that have long been trusted by architects, engineers and building owners around the globe. Micro-Seal® HD creates a hydrophobic barrier that is not affected by weathering, salt, dirt, freezing temperatures, UV light and wind-driven rain, among many other damaging elements.
| Note to Specifier – CSI Reference Codes | |
| 04 2 00 | Exterior Stone, Cladding, Stone Masonry |
| 07 19 00 | Acrylic, Silane Siloxane, Penetrating Polyester, Hybrid Water Repellents |
| 09 24/25 | Cement Plastering |
Best Tools for Application
Small Surfaces
A foam brush is recommended to soak in and saturate your substrate.
Medium Surfaces
Use a small hand pump sprayer.
Large Surfaces
Use an airless sprayer with a spray tip size between .035mm to .051mm.
Application Best Practices
1) Step One: Prepare the surface and confirm surface moisture is less than 25%. Remove 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.
2) Step Two: Perform a test application to confirm fit and finish.
3) Step Three: Apply the product according to It’s TDS.
4) Step Four: Let cure.
5) Step Five: Perform post application test to assure results are achieved.
Benefits of Concentrates and How to Mix
- Reduces carbon footprint
- Reduces job site and landfill waste
- Reduces worker and supply chain fatigue
- Refer to the description on the packaging for dilution ratios.
- Pour contents of concentrate into an empty container. The container size should be the size of the finished amount of product.
- Fill the container with clean water – we recommend distilled water for best results.
- Mix lightly with a stir stick.
Specification and Ordering Options
Substrate Uses and Anticipated Coverage Rates
Substrate porosity varies due to type of substrate and/or the age of the surface and its exposure to weathering. As a result, coverage rates may also vary. In addition, in certain applications, two coats may be required. Please contact us for coverage estimates. Best practices are to first perform a test application on the substrate, followed by a rilem tube test to ensure adequate coverage/absorption.
Refer to the product TDS for Surface Preparation and Application Methods.
Need help? Call 1-888-765-7070 Option 2.
| Substrate | Sq Ft / Gallon | # of Coats* |
| Wood | 160-210 | 1 |
| Concrete and Masonry Block | 50-80 | 1 |
| Lightweight Block | 40-55 | 1 |
| Adobe Block/Natural Stone | 70-90 | 1 |
| Clay Brick | 60-70 | 1 |
| Stucco | 110-160 | 1 |
| Concrete (vertical & horizontal) | 135-160 | 1 |
| Concrete Curing | 310-410 | 1 |
| EFIS | 90-130 | 1 |
Testing Data and Product Characteristics
Testing Data
| ASTM C666 | 2200 Cycles – No effect |
| ASTM C672 | 100 Cycles No Mass Loss, No Scaling |
| ASTM D2243 | Do Not Freeze |
| ASTM G154 | 2,500 Hours No Loss in Repellency |
| ASTM C672/M | 100 Cycles Treated Concrete, No Scaling |
| ASTM E-514 | 98.7% Leak Red Water Pen Fed Spec |
| SS-W-110C, ASTM C140 | 75% Min Required, 96.8% Leak Reduction |
| ASTM D-1653 | 98.6% Effective |
| ASTM C67 | 100% Vapor Permeable |
| ASTM G | 98.6% Effective |
| ASTM E84 | 3,500 Hours- No Change |
| NCHRP No. 244 | 95% Reduction, Series IV Salt Pounding 87% Reduction, Series II Salt Pounding 87% Reduction, Series II Chloride Ion Absorption |
Product Characteristics
| Silane/Siloxane | Active Content 100% |
| Reactive Solids | 40% |
| Volume Solids | 4% |
| Color of Material | Milky White |
| Odor | Slight Odor |
| V.O.C. | 0 g/L V.O.C. Compliant in North America |
| Flash Point | Non-Flammable |
| pH Value | 6 |
| Viscosity | 9.6 Seconds No. 4 Ford Cup |
| Weight | Approximately 8.7 lbs./Gal. |
| Surface Dry/Recoat/Usable | Approximately 1 Hour |
| Coalescence Cure Time | 5 to 7 days |
Approvals, Qualifications and Associations
Call 1-888-765-7070 Option 2 for additional assistance.
| LAUSD – OESH | Approved |
| LEED Points | Up to 3 Points |
| LEED (New Construction) | Available |
| LEED (New Schools/CHPS) | Available |
| CARB | Compliant |
| SCAQMD | Compliant |
| All Other States and Canada | Compliant |
| FDA | Meets Requirements |
| USGBC | Member |
| APTA | Member |
| HPD | Various Products Approved |
| American Institute of Architecture | Two Approved CE courses |