---
title: "Radonseal — $215K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/radonseal"
last_updated: "2026-08-08T17:32:44.946Z"
locale: en
meta:
description: "Niche score 55/100 · $215K/yr market · 90K searches/yr · $117.51 avg price. Weak search conversion (2.0%) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $215K/yr market · 90K searches/yr · $117.51 avg price. Weak search conversion (2.0%) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Radonseal — $215K/yr Amazon US Niche (2026) - Flapen"
---
# **radonseal**
**Worth a look**
Shows low returns (1.3%), but weak search conversion (2.0%) keeps it on the watch list.
Market size 41Growth 63Conversion 25Competition 61Returns 88Price range 31Avg price 69Brand share 44Review moat 64Quality gap 63
**Returns**
**Great****1.3%**
return rate — above 5% kills the launch gate
**Avg price**
**Good****$117.51**
avg listing price — sweet spot $15–$100
**Review moat**
**Good****951.93**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Good****+40.2%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Competition**
**Good****48%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****79%**
top-5 brand share — brands hold most of the demand
**Market size**
**Okay****$215K**
$215K/yr · 90K searches
**Price range**
**Okay****$6.63–$279.05**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Okay****2.0%**
search→purchase rate — share of searches ending in a sale
**Signals**[** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, radonseal is a $215K/yr Amazon United States market (90K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Apr–Jun–Jul. Verdict: Worth a look — 55/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **radonseal market data**
- **Units sold / yr**
- **3K–4K**
- avg 100–250/product
- **Revenue / yr**
- **$353K–$470K**
- units × avg price
- **Conversion rate**
- **2.0%**
- **Avg BSR**
- **#390**
- **Page quality**
- **0%**
- **Prime**
- **66%**
- **Sponsored**
- **76%**
- **Out of stock**
- **1.7%**
- **Avg brand age**
- **62 months**
- **Avg seller age**
- **163 days**
## **Competition & brand share**
The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**15 **▲rising
**Sellers**
**76**
**Top-5 brand share**
**79%**
Top 20: 100%
**Top-5 click share**
**48%**
Top 20: 91%
**Open market**
**15%**
- RadonSeal36% - SolidFix Solutions16% - DRICORE11% - Applied Technologies9% - HXOGYUB7% - DAP6% - Open — no brand owns it (9 brands, 15%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +40.2% search growth over the last 90 days.
3K2KBlack Friday '24Spike '25Spike '26Prime Day '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, Jun, Jul · busiest ÷ quietest = 2.2×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/radonseal/trend)
## **Top radonseal search terms**
- **foundation crack repair injection kit**14K/yr+99.2%1.8% conv. - **foundation repair kit**7K/yr+152.8%1.1% conv. - **radonseal**8K/yr+94.2%2.8% conv. - **foundation crack filler**5K/yr+189.4%3.3% conv. - **foundation crack repair**6K/yr-0.3%4.1% conv. - **epoxy injection kit**4K/yr+51.7%1.1% conv. - **dricore concrete repair crack injection kit**3K/yr+113.4%6.6% conv. - **foundation epoxy injection kit**3K/yr-24.9%0.5% conv. - **radon seal**4K/yr-7.4%4.0% conv. - **dricore**4K/yr-10.6%1.7% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/radonseal/search-terms)
## **Top radonseal products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$11K10%$21K15%$32K20%$43K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**RadonSeal Complete DIY Foundation Crack Repair Kit 10 ft - Low-Viscosity Urethane Injection Sealant for Crawl Spaces & Concrete Basement Walls - Stops Water Leaks - Drill-Free Filler**RadonSeal**$154.66**4.6★1,167 rev](https://www.amazon.com/dp/B006OP30L6) [2**Concrete Crack Injection Kit DIY Basement Wall Crack Repair Polyurethane Leak Seal System Stops Active Water Leaks in Foundation Walls Easy No-Dig Injection Repair Kit - Ideal for DIY Projects**SolidFix Solutions**$131.17**4.3★8 rev](https://www.amazon.com/dp/B0DL34BJ31) [3**DRICORE PRO Concrete Repair Crack Injection Kit (5) | Injectable Filler: Repair Cracked Foundations Walls Basements Cement Structures | Waterproof Wet Or Dry Cracks | Expands 15x Its Volume**DRICORE**$66.24**3.6★9 rev](https://www.amazon.com/dp/B0FBCG3CZJ) [4**RadonSeal Plus Concrete Sealer Deep Penetrating Waterproofing for Basement Floors Foundation Walls & Concrete Block Reduces Moisture & Strengthens Concrete (5 Gallon)**RadonSeal**$239.15**4.1★360 rev](https://www.amazon.com/dp/B013P3QE1W) [5**10 Fast Set Concrete Foundation Crack Repair Kit-Hydra Stop 300 Injection System Polyurethane Concrete Crack Repair Basement Wall Leak Sealant & Foundation Concrete Filler Tough Waterproof Seal**Applied Technologies**$156.00**4.3★701 rev](https://www.amazon.com/dp/B008DG7UCO)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**SolidFix Wall Crack Pro Repair Kit - Stops Basement & Foundation Leaks Permanently - Professional Urethane Injection System - DIY Friendly (Repairs 10ft of Cracks - Without Tool)**SolidFix Solutions**$124.89**7 rev4mo ago](https://www.amazon.com/dp/B0GSCM1T76) [**SOLIDFIX Solutions Concrete Crack Repair Kit Foundation Crack Repair for Basement Walls Fast Setting and Easy to use Ideal for Basement Foundation Repair & DIY Projects. Made in the US (5 Feet Fix)**SolidFix Solutions**$84.75**8 rev4mo ago](https://www.amazon.com/dp/B0DL3HKDXG) [**Fernco 10 ft Basement and Foundation Wall Crack Repair Kit Leak Stop and Radon Gas Protection Pro Kit**Fernco**$137.56**11 rev6mo ago](https://www.amazon.com/dp/B0GFFGZ9Y2) [**SolidFix 10ft Concrete Crack Repair Kit with All Tools Professional Urethane Injection System Wall Repair Paste for DIY Projects -Ideal Crack Filler to Stop Basement & Foundation Leak Permanently**SolidFix Solutions**$157.47**7 rev1y ago](https://www.amazon.com/dp/B0FFBSCXB8) [**DRICORE PRO Concrete Repair Crack Injection Kit (5) | Injectable Filler: Repair Cracked Foundations Walls Basements Cement Structures | Waterproof Wet Or Dry Cracks | Expands 15x Its Volume**DRICORE**$66.24**9 rev1y ago](https://www.amazon.com/dp/B0FBCG3CZJ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**SOLIDFIX Solutions Concrete Crack Repair Kit Foundation Crack Repair for Basement Walls Fast Setting and Easy to use Ideal for Basement Foundation Repair & DIY Projects. Made in the US (5 Feet Fix)**SolidFix Solutions**$84.75**4.3★**▲ 236%**](https://www.amazon.com/dp/B0DL3HKDXG) [**SolidFix Wall Crack Pro Repair Kit - Stops Basement & Foundation Leaks Permanently - Professional Urethane Injection System - DIY Friendly (Repairs 10ft of Cracks - Without Tool)**SolidFix Solutions**$124.89**5.0★**▲ 209%**](https://www.amazon.com/dp/B0GSCM1T76) [**Concrete Crack Injection Kit DIY Basement Wall Crack Repair Polyurethane Leak Seal System Stops Active Water Leaks in Foundation Walls Easy No-Dig Injection Repair Kit - Ideal for DIY Projects**SolidFix Solutions**$131.17**4.3★**▲ 194%**](https://www.amazon.com/dp/B0DL34BJ31) [**DRICORE PRO Concrete Repair Carbon Fiber Reinforcement Kit (Step Three) | Use Reinforcing Strip With Adhesive To Seal Vertical Indoor and Outdoor Cracks in Home Wall Basement Building Office Workplace**DRICORE**$83.78**4.1★**▲ 145%**](https://www.amazon.com/dp/B08HD7BZ3Y) [**DRICORE PRO Concrete Repair Crack Injection Kit (5) | Injectable Filler: Repair Cracked Foundations Walls Basements Cement Structures | Waterproof Wet Or Dry Cracks | Expands 15x Its Volume**DRICORE**$66.24**3.6★**▲ 134%**](https://www.amazon.com/dp/B0FBCG3CZJ)
**~~View all trending →~~**
## **What buyers say about radonseal**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**17%
*“Excellent product”*
**Ease Of Use**15%
*“Easy to use”*
**Advertised Vs Actual Product**11%
*“As Advertised”*
**Efficiency**10%
*“Works great”*
**Value For Money**7%
*“Good price”*
**Maintenance And Repair**4%
*“Works great for small repairs”*
**Leak-Proof**4%
*“No more leak”*
**Instructions/User Manual/Troubleshooting**3%
*“Instructions were clear”*
**Material Quality**2%
*“That said, the kit itself actually seems very complete and professional, and the materials appear high quality and substantial compared to some cheaper repair options”*
**Durability**2%
*“lasts, blends in”*
### **What buyers complain about **
**Durability**11%
*“Durability questionable”*
**Functionality-Overall**10%
*“Didn't work”*
**Quality-Overall**7%
*“Amazon needs better quality control”*
**Color**7%
*“color doesn't match”*
**Ease Of Use**7%
*“Difficult to use”*
**Value For Money**5%
*“the price almost doubled”*
**Thickness**4%
*“your product is way too thin”*
**Water Resistance**3%
*“Not waterproof”*
**Assembly/Installation**3%
*“take your time with the setup”*
**Leak-Proof**3%
*“I inevitably spilled some”*
### **Top return reasons **
**Functionality-Overall**15%
**Color**13%
**Leak-Proof**13%
**Advertised Vs Actual Product**13%
**Value For Money**6%
**Size-Overall**6%
**Defective Material/Parts**6%
**Material Quality**4%
**Maintenance And Repair**4%
**Hard Feel**3%
## **Common questions**
- **Is radonseal profitable to sell on Amazon United States?**
- The niche generates $215K/yr across 29 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is +40.2%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the radonseal niche?**
- 15 brands and 76 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 79% of demand.
- **What do buyers complain about in radonseal?**
- Top complaints mined from reviews: Durability, Functionality-Overall, Quality-Overall. The return rate is 1.3%.
- **When does demand for radonseal peak?**
- Demand peaks in Apr–Jun–Jul; the busiest month runs 2.2× the quietest.
- **What does it cost to enter the radonseal niche?**
- Listings span $6.63–$279.05; the average listing price is $117.51 (sweet spot $15–$100). The average incumbent carries 952 reviews — the moat a new listing must climb.
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