---
product_id: 14333542
title: "Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal)"
brand: "radonseal"
price: "€ 371.93"
currency: EUR
in_stock: true
reviews_count: 8
category: "Radon Seal"
url: https://www.desertcart.hr/products/14333542-plus-concrete-sealer-deep-penetrating-waterproofing-for-basement-floors-foundation
store_origin: HR
region: Croatia
---

# Penetrates 4 inches deep Strengthens & hardens concrete Long-lasting internal seal Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal)

**Brand:** radonseal
**Price:** € 371.93
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal Deep, Live Dry: The Ultimate Concrete Armor for Your Home

## Quick Answers

- **What is this?** Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal) by radonseal
- **How much does it cost?** € 371.93 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/14333542-plus-concrete-sealer-deep-penetrating-waterproofing-for-basement-floors-foundation)

## 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

- • **Eco-Friendly & Safe DIY:** Water-based, zero VOCs, no fumes—apply indoors with confidence and ease.
- • **Invisible Yet Invincible:** No surface film or gloss—preserves concrete’s natural look while providing a permanent barrier.
- • **Concrete Reinforcement Power:** Chemically densifies and hardens concrete, reducing dusting and freeze-thaw damage.
- • **Deep Penetration, Maximum Protection:** Seals concrete pores up to 4 inches deep to block moisture and radon at the source.
- • **Versatile Basement & Foundation Shield:** Ideal for floors, walls, slabs, and blocks; compatible with paints and coatings for seamless finishing.

## Overview

RadonSeal Plus Concrete Sealer is a professional-grade, water-based formula that penetrates up to 4 inches into concrete to create a durable, invisible barrier against moisture, vapor, and radon gas. It strengthens and densifies concrete, preventing damage from salts and freeze-thaw cycles, while remaining breathable to maintain structural integrity. Easy to apply with no surface film, it’s perfect for basement floors, foundation walls, and slabs, offering long-lasting protection with zero VOCs and no harmful fumes.

## 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

- DEEP-PENETRATING CONCRETE SEALER – RadonSeal Plus penetrates up to 4 inches 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.
- BASEMENT WATERPROOFING SEALER – Helps reduce moisture seepage through concrete floors and walls by sealing the concrete from within. Ideal for damp basements, foundation walls, slabs, and concrete block exposed to water and ground moisture.
- LONG-LASTING INTERNAL SEAL – Unlike acrylic or epoxy coatings that sit on the surface, RadonSeal reacts inside the concrete to form a deep, long-lasting seal that won’t 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 damage.
- 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 – Seals and prepares concrete surfaces while helping protect coatings from moisture-related damage. Treated surfaces are compatible with concrete paints, epoxy coatings, clear sealers, overlays, and adhesives.
- IDEAL FOR BASEMENTS & FOUNDATIONS – Designed 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. Ideal for sealing 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 | B00ITZ9VNU |
| Best Sellers Rank | #159,859 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #468 in Hardware Sealers |
| Brand Name | RadonSeal |
| Color | Clear |
| Compatible Material | Concrete |
| Customer Reviews | 4.2 4.2 out of 5 stars (129) |
| Included Components | 1 |
| Item Dimensions | 10 x 24 x 10 inches |
| Item Form | Liquid |
| Item Weight | 24 Pounds |
| Manufacturer | Novion |
| Material Type | Blended Silicate |
| Model | 111 |
| Number of Items | 1 |
| Part Number | 111 |
| Style Name | PLUS |
| Surface Recommendation | Floors,Walls |
| UPC | 856255006034 |
| Unit Count | 320.0 Fluid Ounces |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** RadonSeal
- **Item Weight:** 24 Pounds
- **Item dimensions L x W x H:** 10 x 24 x 10 inches
- **Material:** Blended Silicate
- **Style:** PLUS

## Images

![Plus Concrete Sealer – Deep Penetrating Waterproofing for Basement Floors, Foundation Walls & Concrete Block – Reduces Moisture & Strengthens Concrete (2.5 Gal) - Image 1](https://m.media-amazon.com/images/I/71C7EgA98uL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ easy to use, significantly lowered both moisture and radon levels in just 30 days
*by 2***M on December 10, 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 January 1, 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.

### ⭐⭐⭐⭐⭐ Very easy to apply. No odor.
*by J***J on September 3, 2023*

I poured it out of the 2 gal container in various areas spreading with a broom on a 43 year old cement basement floor after hand scrubbing first 2 days before. It soaked in well and the reapply 40 min later also did well. Then I took a damp flat mop another 40 min later to get up any still wet areas. No smell at all. I won't know until I finish the total basement floor and test for radon if it helps. It did give a low sheen and I can see that the surface is sealed.

## 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

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-04-23*