---
title: "Waterproof Foam Sealant — $95K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/waterproof-foam-sealant"
last_updated: "2026-08-05T22:48:10.546Z"
locale: en
meta:
description: "Niche score 59/100 · $95K/yr market · 90K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 59/100 · $95K/yr market · 90K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Waterproof Foam Sealant — $95K/yr Amazon US Niche (2026) - Flapen"
---
# **waterproof foam sealant**
**Worth a look**
Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 24Growth 52Conversion 57Competition 61Returns 100Price range 84Avg price 91Brand share 41Review moat 40Quality gap 76
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$21.49**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$6.32–$67.07**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Competition**
**Good****48%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Good****4.9%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Good****+22.7%**
90-day search growth — must beat 0% to launch
**Brand share**
**Okay****80%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Okay****2,476**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Bad****$95K**
$95K/yr · 90K searches
According to Flapen's Amazon United States niche tracking, waterproof foam sealant is a $95K/yr Amazon United States market (90K searches/yr). The top 5 brands hold 80% of demand. Verdict: Worth a look — 59/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **waterproof foam sealant market data**
- **Units sold / yr**
- **5K–6K**
- avg 100–250/product
- **Revenue / yr**
- **$107K–$129K**
- units × avg price
- **Conversion rate**
- **4.9%**
- **Avg BSR**
- **#91**
- **Page quality**
- **0%**
- **Prime**
- **81%**
- **Sponsored**
- **78%**
- **Out of stock**
- **4.6%**
- **Avg brand age**
- **50 months**
- **Avg seller age**
- **169 days**
## **Competition & brand share**
The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▲rising
**Sellers**
**86**
**Top-5 brand share**
**80%**
Top 20: 96%
**Top-5 click share**
**48%**
Top 20: 89%
**Open market**
**15%**
- Great Stuff41% - STANLEY15% - Loctite11% - KRAKEN BOND8% - SPRAYMAN6% - --4% - Open — no brand owns it (7 brands, 15%)
## **Demand & seasonality**
Weekly Amazon search volume, last 55 weeks — +22.7% search growth over the last 90 days.
2K2KSpike '25Spike '26 seasonJulAugSepOctNovDecJanFebMarAprMayJunJul
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/waterproof-foam-sealant/trend)
## **Top waterproof foam sealant search terms**
- **waterproof foam sealant**16K/yr+27.6%2.7% conv. - **waterproof foam**12K/yr+49.3%1.4% conv. - **big gap filler spray foam**16K/yr+8.8%5.9% conv. - **waterproof spray foam**14K/yr+19.9%4.5% conv. - **great stuff big gap filler**13K/yr+26.4%7.4% conv. - **waterproof expanding foam**7K/yr+14.9%4.5% conv. - **big gap filler**6K/yr+18.4%5.0% conv. - **waterproof expanding foam sealant**6K/yr+3.8%3.0% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/waterproof-foam-sealant/search-terms)
## **Top waterproof foam sealant 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%4%$4K8%$8K12%$11K16%$15K1101001K10K100K 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**Great Stuff 99108860 Smart Dispenser Big Gap Filler Cream**Great Stuff**$10.14**4.5★1,668 rev](https://www.amazon.com/dp/B07JDJ28LW) [2**Stanley F903 Black Spray Foam Sealant (2x12oz) Waterproof Expanding Polyurethane Foam for RV Pond Waterfall Landscape & Automotive Applications UV Resistant Gap Filler Foam | 2 Pack**STANLEY**$21.24**4.2★219 rev](https://www.amazon.com/dp/B0F3Y1P51V) [3**Great Stuff 99112876 Smart Dispenser Multipurpose Black 12 Oz.**Great Stuff**$10.77**4.4★2,322 rev](https://www.amazon.com/dp/B07JD35J14) [4**Loctite Tite Foam Big Gaps Spray Foam Sealant 12 fl oz Can 1 Pack - Polyurethane Expanding Insulation**Loctite**$8.20**4.4★11,678 rev](https://www.amazon.com/dp/B07Q3WPB6B) [5**Great Stuff 99108824 Smart Dispenser Gaps & Cracks Cream 12 Ounce**Great Stuff**$8.16**4.5★9,263 rev](https://www.amazon.com/dp/B07GLG7B3Z)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Stanley F905 Gaps & Cracks Sealant (2x12 Oz.) Polyurethane Spray Foam Insulation for Window & Door Waterproof Gap Filler Low Expansion Foam for Indoor & Outdoor Use | Straw Use | 12 Oz. 2 Pack**STANLEY**$16.41**112 rev1y ago](https://www.amazon.com/dp/B0FDB98H9R) [**Sprayman Black Waterfall Foam Sealant - (2x12oz) Expanding Polyurethane Pond Foam Sealer UV Resistant Water Proof Spray for Landscape & Exterior Straw Use 2 Pack**SPRAYMAN**$21.86**169 rev1y ago](https://www.amazon.com/dp/B0FCSHV2TL) [**Stanley F903 Black Spray Foam Sealant (2x12oz) Waterproof Expanding Polyurethane Foam for RV Pond Waterfall Landscape & Automotive Applications UV Resistant Gap Filler Foam | 2 Pack**STANLEY**$21.24**219 rev1y ago](https://www.amazon.com/dp/B0F3Y1P51V) [**Kraken Bond Black Spray Waterfall Foam Sealant - (2x12oz) Expanding Polyurethane Pond Foam Sealer Black UV Resistant Insulating Spray for Landscape & Exterior Straw Use 2 Pack**KRAKEN BOND**$22.32**321 rev2y ago](https://www.amazon.com/dp/B0D3VKMG5F) [**Sprayman Gaps and Cracks Filler Foam - Polyurethane Expanding Foam Sealant for Insulating Doors & Windows Waterproof & Paintable Straw Use - 12oz 2 Pack**SPRAYMAN**$15.85**256 rev2y ago](https://www.amazon.com/dp/B0D2Y7DWCC)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Great Stuff 99112849 Smart Dispenser Pond & Stone 12 oz Black**Great Stuff**$13.56**4.5★**▲ 212%**](https://www.amazon.com/dp/B07GL5MP2X) [**Great Stuff Big Gap Filler Expanding Straw Foam 12-Ounce- 157906 - Pack of 4 Cans**Gaps and Cracks**$35.53**3.8★**▲ 162%**](https://www.amazon.com/dp/B00OSES3J4) [**Stanley F905 Gaps & Cracks Sealant (2x12 Oz.) Polyurethane Spray Foam Insulation for Window & Door Waterproof Gap Filler Low Expansion Foam for Indoor & Outdoor Use | Straw Use | 12 Oz. 2 Pack**STANLEY**$16.41**4.2★**▲ 98%**](https://www.amazon.com/dp/B0FDB98H9R) [**Great Stuff 157911 Insulating Foam Sealant 20 Ounce Ivory**Great Stuff**$14.87**4.5★**▲ 92%**](https://www.amazon.com/dp/B0002YX98O) [**Kraken Bond Gaps & Cracks Expanding Foam Sealant - (2x12oz) High Expansion Polyurethane Spray Foam for Window & Door Straw Use Waterproof High Yield Gap Filler - 2 Pack**KRAKEN BOND**$15.96**4.2★**▲ 82%**](https://www.amazon.com/dp/B0CKPZC9KL)
**~~View all trending →~~**
## **What buyers say about waterproof foam sealant**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Efficiency**15%
*“it works great”*
**Advertised Vs Actual Product**14%
*“As advertised”*
**Quality-Overall**14%
*“Very good...fixed my problem right away and easily, thank you”*
**Ease Of Use**12%
*“Easy to work with”*
**Value For Money**7%
*“Excellent value”*
**Stretchability/Expandability/Elasticity**4%
*“Expands well”*
**Spray/Flow**3%
*“It sprays good as long as you ready the instructions”*
**Color**2%
*“Good color”*
**Adhesion/Stickiness**2%
*“it adhered well”*
**Durability**2%
*“Very Durable”*
### **What buyers complain about **
**Spray/Flow**9%
*“Didn't spray”*
**Color**8%
*“wrong color”*
**Quality-Overall**8%
*“Complete garbage”*
**Adhesion/Stickiness**7%
*“sticky”*
**Functionality-Overall**7%
*“Didn't work”*
**Leak-Proof**6%
*“then leaked out while spraying”*
**Ease Of Use**6%
*“Not easy to use”*
**Ease Of Cleaning**5%
*“made an absolute mess”*
**Value For Money**5%
*“Too expensive”*
**Stretchability/Expandability/Elasticity**3%
*“does not expand at all”*
### **Top return reasons **
**Size-Overall**27%
**Material Quality**18%
**Value For Money**16%
**Advertised Vs Actual Product**9%
**Functionality-Overall**8%
**Thin**5%
**Defective Material/Parts**4%
**Thickness**3%
**Quality-Overall**2%
**Strength**1%
## **Common questions**
- **Is waterproof foam sealant profitable to sell on Amazon United States?**
- The niche generates $95K/yr across 32 tracked products. 90-day search growth is +22.7%. Flapen's verdict: Worth a look (59/100).
- **How competitive is the waterproof foam sealant niche?**
- 13 brands and 86 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 80% of demand.
- **What do buyers complain about in waterproof foam sealant?**
- Top complaints mined from reviews: Spray/Flow, Color, Quality-Overall. The return rate is 0.0%.
- **When does demand for waterproof foam sealant peak?**
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- **What does it cost to enter the waterproof foam sealant niche?**
- Listings span $6.32–$67.07; the average listing price is $21.49 (sweet spot $15–$100). The average incumbent carries 2,476 reviews — the moat a new listing must climb.
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