radonseal
Worth a lookShows low returns (1.3%), but weak search conversion (2.0%) keeps it on the watch list.
Returns
Great1.3%return rate — above 5% kills the launch gate
Avg price
Good$117.51avg listing price — sweet spot $15–$100
Review moat
Good951.93avg incumbent reviews — the moat a new listing must climb
Growth
Good+40.2%90-day search growth — must beat 0% to launch
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Competition
Good48%top-5 click share — leaders hold, buyers still browse
Brand share
Okay79%top-5 brand share — brands hold most of the demand
Market size
Okay$215K$215K/yr · 90K searches
Price range
Okay$6.63–$279.05cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Okay2.0%search→purchase rate — share of searches ending in a sale
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
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.Peak months: Apr, Jun, Jul · busiest ÷ quietest = 2.2×
Top radonseal search terms
- foundation crack repair injection kit14K/yr
- foundation repair kit7K/yr
- radonseal8K/yr
- foundation crack filler5K/yr
- foundation crack repair6K/yr
- epoxy injection kit4K/yr
- dricore concrete repair crack injection kit3K/yr
- foundation epoxy injection kit3K/yr
- radon seal4K/yr
- dricore4K/yr
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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$154.664.6★1,167 rev
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$131.174.3★8 rev
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$66.243.6★9 rev
RadonSeal Plus Concrete Sealer Deep Penetrating Waterproofing for Basement Floors Foundation Walls & Concrete Block Reduces Moisture & Strengthens Concrete (5 Gallon)
RadonSeal$239.154.1★360 rev
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$156.004.3★701 rev
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$124.897 rev
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$84.758 rev
Fernco 10 ft Basement and Foundation Wall Crack Repair Kit Leak Stop and Radon Gas Protection Pro Kit
Fernco$137.5611 rev
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$157.477 rev
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$66.249 rev
Trending
90-day click momentumSOLIDFIX 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$84.754.3★
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$124.895.0★
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$131.174.3★
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$83.784.1★
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$66.243.6★
What buyers say about radonseal
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product”
“Easy to use”
“As Advertised”
“Works great”
“Good price”
“Works great for small repairs”
“No more leak”
“Instructions were clear”
“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”
“lasts, blends in”
What buyers complain about
“Durability questionable”
“Didn't work”
“Amazon needs better quality control”
“color doesn't match”
“Difficult to use”
“the price almost doubled”
“your product is way too thin”
“Not waterproof”
“take your time with the setup”
“I inevitably spilled some”
Top return reasons
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.