---
product_id: 23752537
title: "RadonSeal DIY Concrete Foundation Crack Repair Kit (20-ft) - The Homeowner's Solution to Fixing Basement Wall Cracks Like The Pros"
brand: "radonseal"
price: "€ 524.82"
currency: EUR
in_stock: true
reviews_count: 3
category: "Radon Seal"
url: https://www.desertcart.sk/products/23752537-radonseal-diy-concrete-foundation-crack-repair-kit-20-ft-homeowners
store_origin: SK
region: Slovakia
---

# Permanent waterproof seal Covers up to 20 ft cracks No drilling needed RadonSeal DIY Concrete Foundation Crack Repair Kit (20-ft) - The Homeowner's Solution to Fixing Basement Wall Cracks Like The Pros

**Brand:** radonseal
**Price:** € 524.82
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal cracks like a pro, save your foundation (and your weekend)!

## Quick Answers

- **What is this?** RadonSeal DIY Concrete Foundation Crack Repair Kit (20-ft) - The Homeowner's Solution to Fixing Basement Wall Cracks Like The Pros by radonseal
- **How much does it cost?** € 524.82 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/23752537-radonseal-diy-concrete-foundation-crack-repair-kit-20-ft-homeowners)

## 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

- • **Save Big on Repairs:** Fix from inside your basement—no costly excavation or special tools required.
- • **Invisible Hairline Fix:** Low-viscosity urethane penetrates even the tiniest cracks for flawless results.
- • **Effortless Pro-Level Repair:** No drilling or excavation—just inject and seal like a foundation expert.
- • **Long-Lasting Waterproof Barrier:** Expanding closed-cell foam permanently blocks water seepage and protects your home.
- • **DIY Friendly with Standard Tools:** Works seamlessly with any standard caulking gun—no extra gear needed.

## Overview

RadonSeal DIY Concrete Foundation Crack Repair Kit offers a professional-grade, no-drill solution to permanently seal and waterproof basement wall cracks up to 20 feet long. Using low-viscosity polyurethane foam injected via a standard caulking gun, it repairs hairline to wider cracks from the inside—eliminating the need for excavation or special tools. This waterproof, expanding foam cures in 24 hours, providing a durable barrier against water seepage and structural damage.

## Description

RadonSeal DIY Concrete Foundation Crack Repair Kit (20-ft) - The Homeowner's Solution to Fixing Basement Wall Cracks Like The Pros: desertcart.com: Tools & Home Improvement

Review: First time user, ordered double-kit for 2 cracks, Radonseal rocks! - I order the double kit in order to repair 2 separate cracks. Need: - Radonseal Kit - Plastic drop cloth - At least 10 mixing sticks (HD paint department has 6 in. wooden Paint Stick for 1 qt. (30-Pack)) - Roll of paper towels - Wire brush on Makita drill (or manual wirebrush is fine also, comes with Radonseal kit) - Old rags - Pencils - Bucket of hot water to warm up injection foam (20 min prior to injection) - Stack of Paper Plates (for mixing Epoxy, 3 mixes per plate) - Garden sprayer (to flush ports with water) - Box of gloves (always wear 2 sets at a time, keep bottom layer and switch top layer) - Mask - Goggles (comes with Radonseal kit) - A few old towels Preparation: - Check for caulk tube fitment in your caulking gun before opening tube - Tubes will only compress half its length, due to having 2 chambers - Measure and Mark with Pencil port placement areas (6" apart, not 8") - A dollop is roughly a 5/8" round blob - Use paper plates for mixing - about 3 triangular mixing areas around each plate - Spread plastic under crack work areas Epoxy Steps (the more difficult and tedious of the tasks): - Use separate sticks for A and B Epoxy containers when scooping a dollop on paper plate - Use 3rd stick to mix the A and B dollops together, then also use this stick to apply Epoxy. - Be thorough when putting Exoxy around the port rims (but not in center) - Work quickly to put the Epoxy around the port rim - After pressing a port to the premarked wall, smooth out excess around outside of rim with same mixing stick. - Use up rest of 2-dollop mixture for next port(s). I backbuttered the rim of around 3 ports per 2-dollop mixture. - Always work from lower ports to upper - After placing ports, start from bottom when covering the crack with Epoxy. You don't want to go too wide with crack coverage, you have to judge how much of A and B mixture to use up, relative to the length of the entire crack. - When covering cracks between and around ports, you can scoop slightly bigger dollops - try to evenly scoop the same amount of A and B. - Don't force Epoxy into crack, just paste it over surface and around outside of ports Irrigation Steps (easiest of the tasks): - Have old towels positioned under the lowest port of crack(s) - Wait until Epoxy is fingernail-hard before irrigating - TIP: I used a drill bit smaller than the port diameter to check each port to ensure that there was no buildup of epoxy blocking the center of the port to the wall. You can tell when the drill bit is hitting the cement wall based on depth and also feel of hitting cement versus epoxy. - Using garden sprayer with water, put water into topmost port and confirm that it comes out of all the lower ports. - TIP: Use the port stoppers once water comes out to ensure all ports have water coverage - The idea here is to ensure the crack is wet and that in general most or all of the ports are showing they can leak out water (if water passes through the ports, the resin will also pass through the ports). Resin Steps (the more fun of the tasks, but is also a bit messy - double gloves again): - You should be heating up resin tubes in warm/hot water 20 minutes before dispensing. - Ensure you don't lose the "restrictors" when you open the plastic bag for the tubes. - Put tube into caulking gun before taking off the blue cap and stopper (it may be easier to attach the restrictor and host after the tube is in the gun). - Add restrictor to top of tube, then screw on hose and mixing tip. - Wide end of flexible hose goes over caulking gun tip, smaller end over ports - Use the same flexible hose when switching resin tubes to save the resin in the hose. - Go easy on caulking gun trigger, slowly dispense resin, pausing at times (while foam seeps and expands a bit) - TIP: You can see your dispensing rate (should be slow) by watching the tiny air bubbles flowing through the hose. - Continue dispensing into a port until it oozes out of next higher port, then switch to that port and put a stopper on port just completed. - Repeat until all resin is dispensed from bottom port to topmost port and you can see resin coming out the top of the crack. The foam will keep expanding, even for days after the repair. I found that even with a drenching 2" rainfall a mere 12 hours after repairing both cracks the product still worked flawlessly!
Review: Great product - I love this stuff it works really well and has sealed well for me. It doesn’t go as far as I thought it planned for but solid product nonetheless

## Features

- NO DRILLING REQUIRED – The low-pressure injection method eliminates the need for drilling.
- HAIRLINE CRACKS – Low viscosity urethane is suitable even for the repair of hairline cracks.
- NO NEED TO EXCAVATE – Save serious money by repairing the crack from the inside.
- NO SPECIAL TOOLS REQUIRED – Use a standard caulking gun to inject.
- PERMANENT - Prevents water seepage permanently.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00II7JOHM |
| Best Sellers Rank | #160,265 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #413 in Wall Surface Repair Products |
| Brand | RadonSeal |
| Color | Grey |
| Date First Available | February 17, 2014 |
| Full Cure Time | 24 Hours |
| Is Discontinued By Manufacturer | No |
| Item Form | Expanding CLosed-Cell Foam |
| Item model number | 303 |
| Manufacturer | Novion |
| Material | Polyurethane |
| Maximum Gap Fill | 0.5 Inches |
| Number of Items | 1 |
| Surface Recommendation | Poured Concrete Walls, Leaking Form Ties, Cove Joints |
| UPC | 856255006607 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** RadonSeal
- **Color:** Grey
- **Full Cure Time:** 24 Hours
- **Item Form:** Expanding CLosed-Cell Foam
- **Maximum Gap Fill:** 0.5 Inches

## Images

![RadonSeal DIY Concrete Foundation Crack Repair Kit (20-ft) - The Homeowner's Solution to Fixing Basement Wall Cracks Like The Pros - Image 1](https://m.media-amazon.com/images/I/81hTwgRHm0L.jpg)

## Questions & Answers

**Q: How many ports are included in this 20 foot kit?**
A: 30 ports

**Q: Can this product be used to repair wider cracks occurring in stem walls of raised foundations?**
A: We recommend that homeowners only use the kits on cracks up to 1/2" wide. Anything wider we would recommend you contact us first for consultation or hire a crack repair specialist.

**Q: Can you apply product on a wall that is actively leaking**
A: No. If the crack is actively leaking water, you must wait for it to subside before beginning urethane injection.

**Q: Does kit come with both corner and flat ports?**
A: The kit include only flat surface ports. If you need a kit with corner ports, please contact us directly.

## Customer Reviews

### ⭐⭐⭐⭐⭐ First time user, ordered double-kit for 2 cracks, Radonseal rocks!
*by R***G on March 29, 2024*

I order the double kit in order to repair 2 separate cracks. Need: - Radonseal Kit - Plastic drop cloth - At least 10 mixing sticks (HD paint department has 6 in. wooden Paint Stick for 1 qt. (30-Pack)) - Roll of paper towels - Wire brush on Makita drill (or manual wirebrush is fine also, comes with Radonseal kit) - Old rags - Pencils - Bucket of hot water to warm up injection foam (20 min prior to injection) - Stack of Paper Plates (for mixing Epoxy, 3 mixes per plate) - Garden sprayer (to flush ports with water) - Box of gloves (always wear 2 sets at a time, keep bottom layer and switch top layer) - Mask - Goggles (comes with Radonseal kit) - A few old towels Preparation: - Check for caulk tube fitment in your caulking gun before opening tube - Tubes will only compress half its length, due to having 2 chambers - Measure and Mark with Pencil port placement areas (6" apart, not 8") - A dollop is roughly a 5/8" round blob - Use paper plates for mixing - about 3 triangular mixing areas around each plate - Spread plastic under crack work areas Epoxy Steps (the more difficult and tedious of the tasks): - Use separate sticks for A and B Epoxy containers when scooping a dollop on paper plate - Use 3rd stick to mix the A and B dollops together, then also use this stick to apply Epoxy. - Be thorough when putting Exoxy around the port rims (but not in center) - Work quickly to put the Epoxy around the port rim - After pressing a port to the premarked wall, smooth out excess around outside of rim with same mixing stick. - Use up rest of 2-dollop mixture for next port(s). I backbuttered the rim of around 3 ports per 2-dollop mixture. - Always work from lower ports to upper - After placing ports, start from bottom when covering the crack with Epoxy. You don't want to go too wide with crack coverage, you have to judge how much of A and B mixture to use up, relative to the length of the entire crack. - When covering cracks between and around ports, you can scoop slightly bigger dollops - try to evenly scoop the same amount of A and B. - Don't force Epoxy into crack, just paste it over surface and around outside of ports Irrigation Steps (easiest of the tasks): - Have old towels positioned under the lowest port of crack(s) - Wait until Epoxy is fingernail-hard before irrigating - TIP: I used a drill bit smaller than the port diameter to check each port to ensure that there was no buildup of epoxy blocking the center of the port to the wall. You can tell when the drill bit is hitting the cement wall based on depth and also feel of hitting cement versus epoxy. - Using garden sprayer with water, put water into topmost port and confirm that it comes out of all the lower ports. - TIP: Use the port stoppers once water comes out to ensure all ports have water coverage - The idea here is to ensure the crack is wet and that in general most or all of the ports are showing they can leak out water (if water passes through the ports, the resin will also pass through the ports). Resin Steps (the more fun of the tasks, but is also a bit messy - double gloves again): - You should be heating up resin tubes in warm/hot water 20 minutes before dispensing. - Ensure you don't lose the "restrictors" when you open the plastic bag for the tubes. - Put tube into caulking gun before taking off the blue cap and stopper (it may be easier to attach the restrictor and host after the tube is in the gun). - Add restrictor to top of tube, then screw on hose and mixing tip. - Wide end of flexible hose goes over caulking gun tip, smaller end over ports - Use the same flexible hose when switching resin tubes to save the resin in the hose. - Go easy on caulking gun trigger, slowly dispense resin, pausing at times (while foam seeps and expands a bit) - TIP: You can see your dispensing rate (should be slow) by watching the tiny air bubbles flowing through the hose. - Continue dispensing into a port until it oozes out of next higher port, then switch to that port and put a stopper on port just completed. - Repeat until all resin is dispensed from bottom port to topmost port and you can see resin coming out the top of the crack. The foam will keep expanding, even for days after the repair. I found that even with a drenching 2" rainfall a mere 12 hours after repairing both cracks the product still worked flawlessly!

### ⭐⭐⭐⭐⭐ Great product
*by T***Y on November 6, 2025*

I love this stuff it works really well and has sealed well for me. It doesn’t go as far as I thought it planned for but solid product nonetheless

### ⭐⭐⭐⭐ EVEN A NOVICE CAN DO IT!
*by B***U on December 28, 2020*

First of all, I must explain I’m NOT a construction guy at all although I don’t mind the occasional DIY project here and there. If it weren’t for utube, i would have hired someone else to do this and spent tons more money. I found it very helpful to watch lots of videos on the subject from many different content creators to get a wide range of examples & pick up on different techniques & potential obstacles. My situation was this...I have a house built in 1927, poured concrete foundation w/ several significant cracks both vertically & horizontally (see pics). In the past, we installed French drains & poured a concrete patio along the same foundation walls, but during rain storms water would still find its way into our basement. Because of the condition of my particular concrete foundation I decided to spend 90% of my time on prepping my walls in advance before I started any injections to repair the cracks. Grinding concrete is not fun, it can be extremely dusty (even with dust collection bags or filtering vacuum attachments) leaving clean up to be a chore but unlike caulk, after this stuff sets up it becomes solid, so solid that it can become stronger than the concrete around it once your done. So you only have one shot at this, take the time to prep the surface as necessary beforehand, although tedious, time well spent for the final result. The actual using of RadonSeal was super easy, the epoxy hardens quickly so mix up in small quantities as you go. Unless your cracks are perfectly even in width & depth, it won’t look as pretty as you see in the videos or instruction manual so lower your expectations & be ready to problem solve as you go. After injecting this product into my most significant cracks & letting it dry, I went back over & grinded it down level with its surrounding concrete (shown it a different pic, crack injections being slightly less noticeable). In addition to using RadonSeal, I used several coats of DryLock paint on the interior & caulked any cracks on the exterior between my patio & foundation, along with filling any gaps underneath my siding w/ foam spray. It’s now been 6 months, winter has hit & we’ve had several severe rain storms and NO water issues in the basement, at all! Was it all RadonSeal or did the other measures help? It’s probably a combination of both but what I do know is that I am confident that this product did what it was supposed to do and filled the cracks in my walls (I even saw some expand to the exterior cracks & filled all the way through the voids). I wish more injection material came with it because comparing like products, this wasn’t the least expensive but I can’t argue with the results.

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-28*