Description
Hydro Seal 300 is a waterborne emulsion water repellent and stain protector sold by Chemical Concepts under the Bonstone line. It is used to protect masonry, stucco, brick pavers, concrete, aluminum, marble, fabric, and asphalt roof surfaces from water intrusion, UV damage, staining, spalling, and efflorescence.
Hydro Seal 300 Applications
- Water-repellent treatment for masonry, brick, block, stone, and concrete.
- Building restoration and cemetery restoration work on porous exterior surfaces.
- Protection for stucco, marble, fabric, aluminum, and asphalt roof surfaces when approved by testing.
- Jobs that need a breathable sealer rather than a heavy film coating.
- Field maintenance where UV, stains, de-icing salts, mildew, and moisture are concerns.
The product is listed for exterior vertical and horizontal applications, with coverage typically around 100 to 200 square feet per gallon depending on porosity. Always test the surface first, because porous stone and dense concrete can absorb sealer very differently.
Hydro Seal 300 Surface Prep
Clean the surface so water, dirt, oil, loose material, old failed coatings, and biological growth do not block penetration. Let the substrate dry as required for the project. Apply the sealer evenly and avoid puddling, runs, or overspray on nearby finished areas.
Plan the job around substrate porosity, weather, access, and masking. Restoration crews should document the test patch, estimated coverage, and final appearance before treating a full wall, monument, or paved area. That record helps future maintenance teams use the same product and application rate.
For related cleaners and protective products, browse Chemical Concepts sealers and cleaners. Manufacturer information is available from Bonstone.
Ordering Help
Need help estimating coverage or checking whether this water repellent fits your substrate? Call (800) 220-1966 or email [email protected].
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