- Seals and strengthens concrete, concrete blocks and cinder block
- Reduces water seepage, moisture vapor and radon gas infiltration
- Permanent, paintable, non-film sealer will not peel or flake away
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Product Details
About This Product
RadonSeal PLUS Deep Penetrating Concrete Sealer is a permanent, water-based concrete sealer and densifier designed to seal, strengthen and protect porous poured concrete, concrete blocks and cinder blocks from within. Ideal for basement waterproofing and foundation protection, RadonSeal PLUS penetrates deep below the surface and chemically reacts with minerals in concrete to seal pores and capillaries, helping reduce water seepage, moisture vapor, efflorescence and radon gas infiltration.Unlike topical concrete sealers and waterproofing coatings, RadonSeal PLUS does not form a film. The mineral-forming reaction becomes an integral part of the concrete, creating a permanent internal seal that will not peel, flake or wear away. The breathable treatment maintains the natural appearance of concrete while helping strengthen porous surfaces and reduce dusting, pitting and spalling.Ideal for basement floors, foundation walls, concrete slabs, concrete block and cinder block walls. Treated surfaces remain suitable for paints, coatings and adhesives. The zero-VOC, low-odor formula is ready to use and easy to apply with a low-pressure sprayer. RadonSeal PLUS is recommended for older or more porous poured concrete and for concrete block and cinder block. It may also be used on newer poured concrete when a more aggressive penetrating formula is desired.Approx. coverage per 5 Gal.: poured concrete 875-1,125 sq. ft.; concrete block 500-725 sq. ft.
Highlights
- Deep-penetrating protection: penetrates deep into porous concrete and chemically reacts with minerals to seal pores and capillaries from within rather than forming a coating on the surface
- Basements and foundations: ideal for poured concrete basement floors, foundation walls, concrete block and cinder block walls, helping reduce water seepage and moisture vapor through porous concrete
- Concrete sealer and densifier: seals, hardens and strengthens porous concrete from within while helping reduce concrete dusting, pitting and spalling
- Permanent internal seal: becomes an integral part of the concrete and will not peel, flake or wear away unlike topical concrete sealers and coatings, RadonSeal plus never requires reapplication
- Breathable and non-film forming: allows moisture vapor to escape without trapping it beneath a coating leaves no gloss, sheen or slippery surface film and maintains the natural appearance of concrete
- Helps reduce efflorescence: seals pores and capillaries to help reduce the movement of water and dissolved minerals that can cause white efflorescence on basement floors and foundation walls
- Ideal before finishing a basement: seal bare concrete before installing flooring or finishing walls treated concrete remains suitable for paints, coatings, adhesives and finished flooring
- Water-based and low odor: zero-VOC formula is ideal for indoor applications and applies easily to bare, porous concrete with a low-pressure sprayer no mixing or specialized application equipment required
- Fast drying: penetrates without leaving a surface coating that requires an extended cure, allowing treated floors and other concrete surfaces to return to normal use quickly
- For newer or older concrete: RadonSeal plus can be used on newer poured concrete and is recommended for older or more porous poured concrete where a more aggressive penetrating formula is desired
- Concrete block and cinder block: formulated for highly porous concrete masonry, making RadonSeal plus an excellent choice for concrete block and cinder block basement and foundation walls
- Indoor and outdoor use: also suitable for qualifying garage floors, driveways, patios and other poured concrete surfaces, helping protect against freeze-thaw cycles, road salts and chemicals
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Product Information
Specifications
Dimensions
Container Size | 5 Gallon |
|---|---|
Coverage Area (sq. ft.) | 1000 sq ft |
Details
Application | Concrete Waterproofer/Sealer |
|---|---|
Application Method | Brush, Pump-up Sprayer, Roller |
Base Material | Water Based |
Color Family | Clear |
Color/Finish | Clear/Natural |
Dry To Touch Time (hh:mm) | 03:00 |
Finish Family | Natural |
Interior/Exterior | Exterior, Interior |
Maximum hydrostatic pressure (lb.) | 22 |
Maximum Optimal Temperature (F) | 90 |
Minimum Optimal Temperature (F) | 40 |
Number per Package | 1 |
Paint/Stain Features | Abrasion Resistant, Algae Resistant, Chemical Resistant, Densifier, Dries Clear, Driveable Surface, Durable, Fast Drying, High Foot Traffic, Low Odor, Low VOC, Moisture Resistant, Non Slip, Paintable, Sealer, UV/Fade Resistant, Washable, Waterproof |
Recommended Number of Coats | 2 |
Returnable | 90-Day |
Substrate/Surface Material Use | Concrete |
Surface Location | Basement, Basement Floor, Basement Wall, Driveway, Exterior Wall, Foundation, Garage Floor, Garage Wall, Patio, Pool Deck |
Transparency | Clear |
Vertical/Horizontal | Vertical / Horizontal |
Questions & Answers
Can I put Behr Tan Granite Grip Decorative Flat Interior/Exterior Concrete Floor Coating, which I also buy from Home Depot, on top of Radonseal Plus?
We appreciate your interest and question! Yes, you can apply coatings, paints, epoxies, and virtually any other finish over concrete treated with RadonSeal Plus, provided it is applied to a sufficiently porous concrete surface. RadonSeal Plus is a penetrating sealer that is absorbed deep into the concrete rather than forming a surface film or creating a water-repellent surface barrier, so it will not interfere with the adhesion of coatings. Please note that, in some cases, RadonSeal Plus may purge existing sub-efflorescence from within the concrete to the surface. If you notice white mineral deposits appearing during the days following application, simply clean them off. The sooner they are removed, the easier they are to clean, and doing so will not affect or damage the RadonSeal Plus treatment. This will be clearly noted in the included instructions provided with the product. Cheers! ------------ Customer Support RadonSeal
Can I put Behr Granite Grip Concrete Floor Coating on top of Radonseal Plus?
RadonSeal is compatible with all coatings and topical sealers. Allow the RadonSeal to cure for at least 10-days before using the Behr Coating.
What kind of paint can I paint over Radon Seal? In the extended description it states that it leaves surfaces paintable.
The extended description is correct. RadonSeal is compatible will ALL paints. Latex, oil, epoxy, etc.. We typically recommend a good one part epoxy paint for concrete and masonry. Allow the RadonSeal to cure for at least 10-days before painting.
can I use this on painted floors
Penetration sealers cannot be use on painted surfaces. They can only be applied to dry, clean, and porous surfaces.
Hi. Patrick answered my question on 2/9/26 that your crack repair kits would be what I should use. Which do you recommend for fine, hairline cracks?
We appreciate the follow-up! For guidance and information regarding our other products, please contact us directly. Our contact information is available on our website. We are open Monday through Friday until 5:00 PM EST. Kind Regards, ----------------- Customer Support RadonSeal
Hi. I have cracks in my basement walls that are so fine that I don't believe that I can apply a putty or other crack sealant into them that would 1) stay in the crack and 2) adequately seal the crack from radon. Would this product seal these cracks?
That’s a great question, and we appreciate your interest! RadonSeal Concrete Sealer is designed to penetrate and seal the pores and capillaries within the concrete, not to fill or repair cracks. While it may help reduce moisture intrusion in very fine, hairline cracks, it is not intended to seal or repair cracks. To properly repair foundation wall cracks, we recommend using one of our RadonSeal DIY Foundation Crack Repair Kits, polyurethane or epoxy, specifically formulated to fill and seal cracks, including hairline cracks, in poured concrete walls. Kind Regards, ----------------- Patrick Customer Support RadonSeal
What if don't wash my floor at all after radon sealer application on my basement floor
Wet mopping the floor after sealer application not critical to product performance. This step is designed to move or remove over-applied product from surface before it dries. If the plan is to paint, add a coating, overlay, or flooring, then washing is a good idea to avoid any potential bonding issues. If the floor was properly prepared and sufficiently porous, this measure is typically not necessary.
Can RadonSeal be used as a primer for closed cell foam insulation on a poured concrete basement wall?
We appreciate your question and interest! Yes, RadonSeal is a penetrating sealer, not a coating system, so it will not interfere with the adhesion of closed-cell foam. RadonSeal helps block the migration of water vapor and capillary water seepage through concrete, which protects and extends the life of surface coatings and insulation. Note: Before sealing, be sure to repair cracks, seams, and wire ties, as these are common pathways for water leaks. Kind Regards, ----------------- Patrick Product Expert RadonSeal
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Compare Key Features
Product Snapshot | |||
|---|---|---|---|
Ideal for basements, permanently seals concrete, protects against water damage, radon, and efflorescence. | Ideal for customers who want extreme waterproofing, ensuring 15-year protection against water and mildew. | Ideal for enhancing concrete and pavers with a low-gloss wet look, UV protection, and easy application. | Ideal for enhancing concrete and pavers with a high-gloss finish, UV protection, and easy application. |
Coverage Area | |||
1000 sq ft/5 gal | 100 sq ft per gallon | 250-400 sq. ft./gal per coat | 250-400 sq. ft./gal |
Water Resistance | |||
UV Protection | |||
Drying Time | |||
3 hours | 45 minutes dry to touch | Dries to touch in 4-8 hours | 4-8 hours to touch, 24 hours foot traffic |
Slip Resistance | |||
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