---
product_id: 35716395
title: "RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (5 Gallon)"
brand: "radonseal"
price: "€ 675.66"
currency: EUR
in_stock: true
reviews_count: 9
category: "Radon Seal"
url: https://www.desertcart.hr/products/35716395-radonseal-plus-concrete-sealer-deep-penetrating-waterproofing-for-basement-floors
store_origin: HR
region: Croatia
---

# 4-inch deep concrete penetration Strengthens & hardens porous concrete Long-lasting internal waterproof seal RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (5 Gallon)

**Brand:** radonseal
**Price:** € 675.66
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal Deep, Stay Dry, and Strengthen Your Foundation Like a Pro!

## Quick Answers

- **What is this?** RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (5 Gallon) by radonseal
- **How much does it cost?** € 675.66 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/35716395-radonseal-plus-concrete-sealer-deep-penetrating-waterproofing-for-basement-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

- • **Built to Last:** Forms an internal, chemical seal that won’t peel, blister, or wear away over time—unlike typical coatings.
- • **Invisible Protection:** Keeps your concrete’s natural look with a breathable, non-glossy finish that’s paint and coating compatible.
- • **Deep Concrete Defense:** Penetrates up to 4 inches to seal moisture pathways from within, not just on the surface.
- • **Concrete Reinforcement:** Densifies and hardens weak concrete, reducing dusting and boosting resistance to freeze-thaw cycles and salts.
- • **Effortless DIY Application:** Water-based formula applies easily with sprayer, roller, or brush—no special tools or toxic fumes required.

## Overview

RadonSeal Plus is a professional-grade, deep-penetrating concrete sealer that waterproofs and strengthens basement floors and foundation walls by chemically sealing pores up to 4 inches deep. Unlike surface coatings, it creates a durable internal barrier against moisture vapor and water intrusion while reinforcing concrete structure. Easy to apply and invisible once cured, it’s ideal for damp basements, slabs, and concrete block foundations, delivering long-lasting protection without altering the concrete’s natural appearance.

## Description

RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (5 Gallon) - desertcart.com

Review: Good Product and Helpful Customer Service - I bought three 5 gallon buckets (one at a time) of this to seal my basement. I had planned just to do one area of floor and the walls with my first bucket but liked it so much I ended doing all walls and floors in my basement. I also used one bucket of Ion Bond Armor for the room I really wanted sealed and used the extra on the most damp walls after using this sealer. I had to remove a lot of old sealer paint and other stuff on the 60 year old walls. I bought the Bosch Concrete Surface Grinder and ground off all the stuff down to bare concrete before spraying the sealer. After spraying it pushed a lot of the white stuff back out. I bought the cleaner and planned to use it to clean the walls after sealing, but it did not work at all in my case. I spent a lot of time on the phone with Radon Seal and they were very helpful. You have to understand that every basement project is slightly different and there are unique snags. It seems in my case I waited too long to use the cleaner (only two weeks) but I may have had calcium carbonate form. I ended up just using the grinder to clean the walls. I highly recommend the Bosch Concrete Grinder but cannot recommend the Radon Seal Cleaner. After sealing and putting Ion Bond the floors are really well sealed. However, I was under the impression that it would leave the surface able to be painted but in my case water beads up and stays for more than an hour. I have been afraid to try to paint like this, but I am happy with the sealed concrete and may not need to paint. I tried to call Radon Seal to discuss painting after sealing but we must have got wires crossed since they did not return my call, which is unusual given the long phone calls I had with them previously. I will try to cal them again when I have time. All said, I would definitely recommend this sealer and the Ion Bond Armor as well as the Bosch Concrete Surface Grinder. I would not recommend the cleaner. I bought the crack filler foam kit but have not used it yet. One other thing, these guys have a very good web site with tons of information. They said that their main customer service problem is people who buy the stuff but do not go to the Radon Seal web site to read all the information before they start the project. You need to make sure the concrete is bare and will absorb water. I had a couple spots that I did not grind enough and when I said the sealer not soaking in I got the grinder out and went over that spot again and it went fine. You need to realize that doing this is a big project. Granted I had some pretty messy old walls to start with, but the grinding and prep work took a huge amount of time. I have been on the project nearly three months, most of the time grinding. However, putting the sealer on will take about 50 minutes a coat (two or three) plus waiting two or three hours then hosing and scrubbing to make sure there is not excess left clogging the surface. In my case I did this in stages and there were eight or ten days devoted to spraying the sealer since I had to move stuff around to be able to clear an area for working on. 11/27/2014 update. I painted two walls in my garage that were sealed with RadonSeal Plus and Ion Bond Armor. I used Behr Concrete and Masonry Paint (the one with no water proofing). I had been concerned about painting because the floor which was sealed the same way beads up water for many hours and I thought the paint might not sink in enough. The paint sent on well and after a month or two it seems to be holding up without any signs of lifting or pealing. I also have been able to patch some holes with epoxy enhanced patching concrete and it seems to attach well to the already sealed concrete walls and floors. The basement seems to be well sealed now. During the late summer I did not see a huge humidity drop and continued to run my dehumidifier. Without the dehumidifier it seemed to have about 55% RH, possibly due to air still coming in through my garage which under the house and part of the basement. I also have two sump pump pits with water in them that are not yet covered to block evaporation. In years past, without a dehumidifier, the labels peeled off of my wine bottles. Now, in the winter, the RH in the basement is less than the main floor, both with no dehumidifier. There is no sign of any moisture on the walls or eflourescence coming out of the concrete. All said, it was a huge amount of work but I am pleased with the result.
Review: Using this on my second house... - Does exactly as the description describes. I used this for the first time in 2006 in Long Island, NY, in our 1,200sqft basement, after being recommended the product from a friend who had used it 2 years previous. Their basement tested 40x over the recommended levels of radon!!! Not to mention, it flooded several times a year. Two weeks after application it tested well within safe levels at HALF the recommend level!!! Nor have they have any flooding in there since! Needless to say, I was sold, even though we had a brand new house, that tested within the safety range. We applied this to the basement for re-assurance. Super easy to apply. Looks like water, pours/sprays like water and is non-toxic. No bad smell and water clean-up. Doesn't get any easier than that! It's now 2012 and I have finished applying this to another house, the new basement beneath my 1875 miner's cabin. This area of Colorado is notorious for high radon emissions. Unfortunately, I don't have a 'before' reading because the cabin is not yet air tight, hence, I can't get an accurate reading. Once it is airtight in another month or so, I will take a reading and update this post. I'm 100% confident it will come up within the safe range even though my neighbors have had to install expensive, electric mitigation systems. Will keep you posted!

## Features

- DEEP-PENETRATING CONCRETE SEALER – RadonSeal Plus penetrates deep into concrete and reacts within the pore structure to seal capillaries, helping reduce water intrusion and moisture vapor transmission through basement floors and foundation walls.
- FOR BASEMENTS & FOUNDATIONS – Helps reduce moisture seepage through concrete floors and walls by penetrating and reacting within the concrete. Ideal for basement floors, foundation walls, slabs, and concrete block exposed to ground moisture.
- LONG-LASTING INTERNAL SEAL – Unlike acrylic or epoxy coatings that sit on the surface, RadonSeal reacts inside the concrete to form a durable internal seal that will not peel, blister, or wear away over time.
- STRENGTHENS & HARDENS CONCRETE – Chemically densifies and reinforces porous or weak concrete, reducing dusting and improving resistance to water intrusion, salts, and freeze-thaw cycles.
- EASY DIY APPLICATION – Apply with a sprayer, roller, or brush. The water-based formula penetrates deeply into the concrete where it reacts and cures internally, no surface coating or film.
- PAINTABLE & COATING-COMPATIBLE – Prepares concrete surfaces for coatings by helping reduce moisture movement through the substrate. Compatible with concrete paints, epoxy coatings, clear sealers, overlays, and adhesives.
- IDEAL FOR BASEMENTS & FOUNDATIONS – Suitable for basement floors, foundation walls, concrete slabs, garages, and warehouses. Works on poured concrete and concrete block (CMU) foundations.
- COVERS UP TO ~1000 SQ FT PER 5 GALLONS – Coverage varies depending on concrete porosity. Suitable for basement floors, foundation walls, slabs, and concrete block to help reduce moisture vapor transmission.
- NATURAL, INVISIBLE FINISH – Does not change the appearance of concrete. No gloss, no darkening, and no surface film.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B013P3QE1W |
| Best Sellers Rank | #147,376 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #495 in Hardware Sealers |
| Brand | RadonSeal |
| Brand Name | RadonSeal |
| Color | Solid Black |
| Compatible Material | Concrete, Concrete Block, Limestone |
| Customer Reviews | 4.1 out of 5 stars 360 Reviews |
| Global Trade Identification Number | 00856255006027 |
| Included Components | Tools |
| Item Form | Liquid |
| Item Weight | 48 Pounds |
| Manufacturer | Novion |
| Material | Blended Silicate |
| Material Type | Blended Silicate |
| Model | 110 |
| Number of Items | 1 |
| Part Number | 110 |
| Style | PLUS |
| Style Name | PLUS |
| Surface Recommendation | Floors,Walls |
| Unit Count | 640 Fluid Ounces |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** RadonSeal
- **Item Form:** Liquid
- **Material:** Blended Silicate
- **Style:** PLUS
- **Water Resistance Level:** Waterproof

## Images

![RadonSeal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (5 Gallon) - Image 1](https://m.media-amazon.com/images/I/81ZrBdkqy1L.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

### ⭐⭐⭐⭐⭐ Good Product and Helpful Customer Service
*by J***E on August 30, 2014*

I bought three 5 gallon buckets (one at a time) of this to seal my basement. I had planned just to do one area of floor and the walls with my first bucket but liked it so much I ended doing all walls and floors in my basement. I also used one bucket of Ion Bond Armor for the room I really wanted sealed and used the extra on the most damp walls after using this sealer. I had to remove a lot of old sealer paint and other stuff on the 60 year old walls. I bought the Bosch Concrete Surface Grinder and ground off all the stuff down to bare concrete before spraying the sealer. After spraying it pushed a lot of the white stuff back out. I bought the cleaner and planned to use it to clean the walls after sealing, but it did not work at all in my case. I spent a lot of time on the phone with Radon Seal and they were very helpful. You have to understand that every basement project is slightly different and there are unique snags. It seems in my case I waited too long to use the cleaner (only two weeks) but I may have had calcium carbonate form. I ended up just using the grinder to clean the walls. I highly recommend the Bosch Concrete Grinder but cannot recommend the Radon Seal Cleaner. After sealing and putting Ion Bond the floors are really well sealed. However, I was under the impression that it would leave the surface able to be painted but in my case water beads up and stays for more than an hour. I have been afraid to try to paint like this, but I am happy with the sealed concrete and may not need to paint. I tried to call Radon Seal to discuss painting after sealing but we must have got wires crossed since they did not return my call, which is unusual given the long phone calls I had with them previously. I will try to cal them again when I have time. All said, I would definitely recommend this sealer and the Ion Bond Armor as well as the Bosch Concrete Surface Grinder. I would not recommend the cleaner. I bought the crack filler foam kit but have not used it yet. One other thing, these guys have a very good web site with tons of information. They said that their main customer service problem is people who buy the stuff but do not go to the Radon Seal web site to read all the information before they start the project. You need to make sure the concrete is bare and will absorb water. I had a couple spots that I did not grind enough and when I said the sealer not soaking in I got the grinder out and went over that spot again and it went fine. You need to realize that doing this is a big project. Granted I had some pretty messy old walls to start with, but the grinding and prep work took a huge amount of time. I have been on the project nearly three months, most of the time grinding. However, putting the sealer on will take about 50 minutes a coat (two or three) plus waiting two or three hours then hosing and scrubbing to make sure there is not excess left clogging the surface. In my case I did this in stages and there were eight or ten days devoted to spraying the sealer since I had to move stuff around to be able to clear an area for working on. 11/27/2014 update. I painted two walls in my garage that were sealed with RadonSeal Plus and Ion Bond Armor. I used Behr Concrete and Masonry Paint (the one with no water proofing). I had been concerned about painting because the floor which was sealed the same way beads up water for many hours and I thought the paint might not sink in enough. The paint sent on well and after a month or two it seems to be holding up without any signs of lifting or pealing. I also have been able to patch some holes with epoxy enhanced patching concrete and it seems to attach well to the already sealed concrete walls and floors. The basement seems to be well sealed now. During the late summer I did not see a huge humidity drop and continued to run my dehumidifier. Without the dehumidifier it seemed to have about 55% RH, possibly due to air still coming in through my garage which under the house and part of the basement. I also have two sump pump pits with water in them that are not yet covered to block evaporation. In years past, without a dehumidifier, the labels peeled off of my wine bottles. Now, in the winter, the RH in the basement is less than the main floor, both with no dehumidifier. There is no sign of any moisture on the walls or eflourescence coming out of the concrete. All said, it was a huge amount of work but I am pleased with the result.

### ⭐⭐⭐⭐⭐ Using this on my second house...
*by M***N on August 20, 2012*

Does exactly as the description describes. I used this for the first time in 2006 in Long Island, NY, in our 1,200sqft basement, after being recommended the product from a friend who had used it 2 years previous. Their basement tested 40x over the recommended levels of radon!!! Not to mention, it flooded several times a year. Two weeks after application it tested well within safe levels at HALF the recommend level!!! Nor have they have any flooding in there since! Needless to say, I was sold, even though we had a brand new house, that tested within the safety range. We applied this to the basement for re-assurance. Super easy to apply. Looks like water, pours/sprays like water and is non-toxic. No bad smell and water clean-up. Doesn't get any easier than that! It's now 2012 and I have finished applying this to another house, the new basement beneath my 1875 miner's cabin. This area of Colorado is notorious for high radon emissions. Unfortunately, I don't have a 'before' reading because the cabin is not yet air tight, hence, I can't get an accurate reading. Once it is airtight in another month or so, I will take a reading and update this post. I'm 100% confident it will come up within the safe range even though my neighbors have had to install expensive, electric mitigation systems. Will keep you posted!

### ⭐⭐⭐⭐ Simple to apply
*by M***K on October 9, 2012*

Just applied to the basement slab . Application was simple , wet down first with water then apply first coat . After 30 min go back and reapply 2 nd coat . Return after 2hrs and broom out any puddled areas . If not finishing floor , recommendation is washing with wet mop to clean any white residue . Note that floor needs to dry for 10 days prior to covering with new flooring materials. Floor actually dried out in 5 days. Will report back results once I retest radon

## Frequently Bought Together

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-06-23*