--- product_id: 741759893 title: "RadonSeal Plus Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons)" brand: "radonseal" price: "¥21878" currency: JPY in_stock: false reviews_count: 5 category: "Radon Seal" url: https://www.desertcart.jp/products/741759893-radonseal-plus-deep-penetrating-concrete-sealer-for-basement-walls-floors store_origin: JP region: Japan --- # Zero VOC, eco-friendly 4-inch deep penetration Permanent hydrostatic barrier RadonSeal Plus Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons) **Brand:** radonseal **Price:** ¥21878 **Availability:** ❌ Out of Stock ## Summary > 🛠️ Seal Smart, Live Dry: The Pro-Grade Concrete Shield You Can Trust ## Quick Answers - **What is this?** RadonSeal Plus Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons) by radonseal - **How much does it cost?** ¥21878 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/741759893-radonseal-plus-deep-penetrating-concrete-sealer-for-basement-walls-floors) ## Best For - radonseal enthusiasts ## Why This Product - Trusted radonseal brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted Since 1997:** Commercial-grade quality with a money-back guarantee—join thousands of satisfied pros and homeowners. - • **Eco-Safe & Odorless:** Water-based, zero VOC formula ensures safe indoor use with no harmful fumes or toxins. - • **Deep Concrete Defense:** Penetrates up to 4 inches to block water, vapor, and radon gas—ultimate basement protection. - • **Invisible, Breathable Seal:** Integrates with concrete without surface film—no peeling, no fading, just lasting protection. - • **Lasting Structural Strength:** Hardens concrete against dusting, cracking, and freeze-thaw damage for years of durability. ## Overview RadonSeal Plus is a professional-grade, deep-penetrating concrete sealer that protects basement floors and walls by blocking water, vapor, and radon gas up to 4 inches deep. Its water-based, zero VOC formula is safe for indoor use and strengthens concrete against environmental damage without forming a surface film. Trusted since 1997, it offers a permanent, breathable seal that preserves concrete integrity and improves indoor air quality. ## Description Transform your basement into a dry, safe haven with RadonSeal Deep Penetrating Concrete Sealer. Specifically formulated to penetrate deep into concrete, this advanced sealer effectively blocks micro-pores and capillaries up to 4 inches, halting water seepage, vapor transmission, efflorescence, and even radon gas. Not only does RadonSeal seal concrete against water and vapor, but it also fortifies the concrete structure itself. By reducing dusting, crazing, and damage from salts, de-icing chemicals, and freeze-thaw cycles, this sealer prolongs the life of your concrete surfaces. Unlike traditional sealers, RadonSeal is breathable, ensuring moisture doesn’t get trapped within the concrete, a crucial feature for maintaining the integrity of your structures. Safety and environmental consciousness are paramount with RadonSeal. Featuring a water-based formula, this repair kit boasts ZERO VOCs, no fumes, and no solvents, making it non-toxic and non-flammable. This eco-friendly formulation means you can apply it indoors without worrying about harmful odors or health risks. Once applied, RadonSeal becomes an integral part of your concrete, offering a permanent barrier against hydrostatic water pressure. Designed to penetrate deeply without forming a surface film, this home improvement tool ensures there’s no peeling or fading over time. Trusted by professionals since 1997, RadonSeal is a commercial-grade solution that comes with a money-back guarantee, emphasizing its reliability and effectiveness. Whether you’re renovating your basement, protecting foundation walls, or sealing outdoor slabs, RadonSeal Deep Penetrating Concrete Sealer is your go-to choice for durable, long-lasting concrete protection. Review: easy to use, significantly lowered both moisture and radon levels in just 30 days - We bought RadonSeal Plus to help reduce radon levels in our home and ensure proper moisture levels in the concrete floor before installing LVP in our partially finished basement. We were surprised to get moisture test readings in the yellow since, as long as we've lived here, our sump pump has remained bone dry and we've had zero visible signs of water intrusion. After several months of monitoring humidity, dewpoint, etc, we concluded water vapor must be wicking up through the concrete. We decided to apply RadonSeal Plus to only the finished room first, since we need the new LVP installed in time for Christmas gatherings. RadonSeal was easy to apply, had little to no odor, and we could see it was being absorbed effectively into the concrete as it was applied. The instructions say it reaches full strength in 60 to 90 days. After 30 days we're pretty happy with the results so far. Our moisture readings have gone from yellow to green with our latest ASTM F1869 test reading 2.14. Our radon readings have gone from regular highs from 10 to 14 over the 3 months prior to the application, to now showing consistent levels between 4 to 6. This is after doing 1/3 of the basement (ONLY the finished area). After the holidays we'll seal the two unfinished areas of the basement and I'll be happy to report the final results here. Review: Definitely saw lower radon numbers. - Had two rooms downstairs that were not finished just bare concrete. Sprayed all the walls that were in contact with the Earth and sprayed the floors. We already had a radon monitor for years so we knew what the averages were. Our numbers were never high enough to trigger remediation, but it is peace of mind, knowing that they’re even lower now. This definitely brought the radon levels down in conjunction with caulking all cracks first in the floors with radon approved caulk. My recommendation is to do light coats with a pump sprayer. Don’t let the liquid pool. This is not a substitute for homes that have radon levels high enough to require remediation. ## Features - Effective Concrete Protection: RadonSeal concrete sealer penetrates up to 4 inches, blocking water, vapor, efflorescence, and radon gas from concrete surfaces like basement floors and walls. - Strengthens and Preserves: Harden concrete against dusting, crazing, and damage caused by salts, de-icing chemicals, and freeze-thaw cycles. - Environmentally Friendly: Water-based formula with ZERO VOCs, no fumes, solvents, or toxins—safe for indoor use without odors or health concerns. - Permanent Seal: Integrates with concrete for long-term protection against hydrostatic water pressure, without forming a surface film or compromising paintability. - Trusted and Guaranteed: RadonSeal offers commercial-grade quality since 1997, ensuring reliability in sealing and preserving concrete structures ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00ITZ9VNU | | Best Sellers Rank | #191,209 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #874 in Hardware Sealers | | Brand | RadonSeal | | Brand Name | RadonSeal | | Color | White | | Compatible Material | Concrete | | Customer Reviews | 4.3 out of 5 stars 124 Reviews | | Included Components | 1 | | Item Dimensions | 25.4 x 61 x 25.4 centimeters | | Item Form | Liquid | | Item Weight | 24 Pounds | | Item dimensions L x W x H | 25.4 x 61 x 25.4 centimeters | | Item weight | 24 Pounds | | Manufacturer | Novion | | Material | Concrete, Concrete Block | | Material Type | Concrete, Concrete Block | | Model | 111 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | 111 | | Style | Deep-Penetrating Sealer | | Style Name | Deep-Penetrating Sealer | | Surface Recommendation | Floors,Walls | | UPC | 856255006034 | | Unit Count | 320.0 Milliliters | | Water Resistance Level | Waterproof | | Water resistance level | Waterproof | ## Product Details - **Brand:** RadonSeal - **Item dimensions L x W x H:** 25.4 x 61 x 25.4 centimeters - **Item weight:** 24 Pounds - **Material:** Concrete, Concrete Block - **Style:** Deep-Penetrating Sealer ## Images ![RadonSeal Plus Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons) - Image 1](https://m.media-amazon.com/images/I/71C7EgA98uL.jpg) ![RadonSeal Plus Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons) - Image 2](https://m.media-amazon.com/images/I/61iHuujJRtL.jpg) ![RadonSeal Plus Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons) - Image 3](https://m.media-amazon.com/images/I/71S5fMSp36L.jpg) ![RadonSeal Plus Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons) - Image 4](https://m.media-amazon.com/images/I/71XPIcXXl1L.jpg) ![RadonSeal Plus Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons) - Image 5](https://m.media-amazon.com/images/I/713DheGmkYL.jpg) ## Questions & Answers **Q: How is RadonSeal different from coatings or sealers?** A: Unlike traditional coatings that sit on the surface and can peel or trap moisture, RadonSeal absrobs deep into the concrete and works below the surface. It does not form a film, allowing the concrete to remain breathable. **Q: Can I apply paint, epoxy, or coatings over RadonSeal?** A: Yes. When applied to a bare, porous surface, it absorbs into the concrete rather than forming a surface layer, allowing proper adhesion of paints, epoxy, levelers, and coatings. **Q: What is the coverage rate?** A: • Poured Concrete: 175–225 sq. ft. per gallon • Concrete Block: 100–125 sq. ft. per gallon As a general guideline, a 1,000 sq. ft. poured concrete surface requires approximately 5 gallons. A 2.5-gallon container will cover about 500 sq. ft. **Q: Will RadonSeal stop water leaks through cracks?** A: RadonSeal is not designed to stop active leaks through cracks, joints, or seams. These areas should be repaired using appropriate products such as CrackWeld Floor Crack Repair Kit or RadonSeal DIY Foundation Crack Repair Kit. **Q: Can RadonSeal be applied to painted or sealed surfaces?** A: No. RadonSeal must be absorbed through the surface to be effective. It should only be applied to clean, bare, and porous concrete. ## Customer Reviews ### ⭐⭐⭐⭐⭐ easy to use, significantly lowered both moisture and radon levels in just 30 days *by 2***M on 10 December 2024* We bought RadonSeal Plus to help reduce radon levels in our home and ensure proper moisture levels in the concrete floor before installing LVP in our partially finished basement. We were surprised to get moisture test readings in the yellow since, as long as we've lived here, our sump pump has remained bone dry and we've had zero visible signs of water intrusion. After several months of monitoring humidity, dewpoint, etc, we concluded water vapor must be wicking up through the concrete. We decided to apply RadonSeal Plus to only the finished room first, since we need the new LVP installed in time for Christmas gatherings. RadonSeal was easy to apply, had little to no odor, and we could see it was being absorbed effectively into the concrete as it was applied. The instructions say it reaches full strength in 60 to 90 days. After 30 days we're pretty happy with the results so far. Our moisture readings have gone from yellow to green with our latest ASTM F1869 test reading 2.14. Our radon readings have gone from regular highs from 10 to 14 over the 3 months prior to the application, to now showing consistent levels between 4 to 6. This is after doing 1/3 of the basement (ONLY the finished area). After the holidays we'll seal the two unfinished areas of the basement and I'll be happy to report the final results here. ### ⭐⭐⭐⭐⭐ Definitely saw lower radon numbers. *by A***N on 1 January 2026* Had two rooms downstairs that were not finished just bare concrete. Sprayed all the walls that were in contact with the Earth and sprayed the floors. We already had a radon monitor for years so we knew what the averages were. Our numbers were never high enough to trigger remediation, but it is peace of mind, knowing that they’re even lower now. This definitely brought the radon levels down in conjunction with caulking all cracks first in the floors with radon approved caulk. My recommendation is to do light coats with a pump sprayer. Don’t let the liquid pool. This is not a substitute for homes that have radon levels high enough to require remediation. ### ⭐⭐⭐⭐ Easy to use *by A***R on 27 July 2026* Hard to review until it has been in awhile. Don’t really know if it works yet. Easy to apply and clean up. ## Frequently Bought Together - RadonSeal Deep Penetrating Concrete Sealer for Basement Walls and Floors, Seals Concrete Against Water, Vapor and Radon Gas, (2.5 Gallons) - Chapin 20000 Made in USA 1 -Gallon Lawn and Garden Pump Pressured Sprayer, for Spraying Plants, Garden Watering, Weeds and Pests, Polypropylene, Translucent White - RadonSeal Efflorescence Remover - Cleans Efflorescence, Mortar Haze, Lime, and Rust Stains --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/741759893-radonseal-plus-deep-penetrating-concrete-sealer-for-basement-walls-floors](https://www.desertcart.jp/products/741759893-radonseal-plus-deep-penetrating-concrete-sealer-for-basement-walls-floors) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-07*