waterproof foam sealant
Worth a lookShows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Avg price
Great$21.49avg listing price — sweet spot $15–$100
Price range
Great$6.32–$67.07cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Great4.3★avg incumbent rating — lower means beatable quality
Competition
Good48%top-5 click share — leaders hold, buyers still browse
Conversion
Good4.9%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
Okay80%top-5 brand share — brands hold most of the demand
Review moat
Okay2,476avg 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
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.No pronounced peak months · busiest ÷ quietest = 1.5×
Top waterproof foam sealant search terms
- waterproof foam sealant16K/yr
- waterproof foam12K/yr
- big gap filler spray foam16K/yr
- waterproof spray foam14K/yr
- great stuff big gap filler13K/yr
- waterproof expanding foam7K/yr
- big gap filler6K/yr
- waterproof expanding foam sealant6K/yr
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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Great Stuff 99108860 Smart Dispenser Big Gap Filler Cream
Great Stuff$10.144.5★1,668 rev
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$21.244.2★219 rev
Great Stuff 99112876 Smart Dispenser Multipurpose Black 12 Oz.
Great Stuff$10.774.4★2,322 rev
Loctite Tite Foam Big Gaps Spray Foam Sealant 12 fl oz Can 1 Pack - Polyurethane Expanding Insulation
Loctite$8.204.4★11,678 rev
Great Stuff 99108824 Smart Dispenser Gaps & Cracks Cream 12 Ounce
Great Stuff$8.164.5★9,263 rev
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$16.41112 rev
Sprayman Black Waterfall Foam Sealant - (2x12oz) Expanding Polyurethane Pond Foam Sealer UV Resistant Water Proof Spray for Landscape & Exterior Straw Use 2 Pack
SPRAYMAN$21.86169 rev
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$21.24219 rev
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$22.32321 rev
Sprayman Gaps and Cracks Filler Foam - Polyurethane Expanding Foam Sealant for Insulating Doors & Windows Waterproof & Paintable Straw Use - 12oz 2 Pack
SPRAYMAN$15.85256 rev
Trending
90-day click momentum
Great Stuff 99112849 Smart Dispenser Pond & Stone 12 oz Black
Great Stuff$13.564.5★
Great Stuff Big Gap Filler Expanding Straw Foam 12-Ounce- 157906 - Pack of 4 Cans
Gaps and Cracks$35.533.8★
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$16.414.2★
Great Stuff 157911 Insulating Foam Sealant 20 Ounce Ivory
Great Stuff$14.874.5★
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$15.964.2★
What buyers say about waterproof foam sealant
What buyers praise and complain about, mined from review topics.What buyers love
“it works great”
“As advertised”
“Very good...fixed my problem right away and easily, thank you”
“Easy to work with”
“Excellent value”
“Expands well”
“It sprays good as long as you ready the instructions”
“Good color”
“it adhered well”
“Very Durable”
What buyers complain about
“Didn't spray”
“wrong color”
“Complete garbage”
“sticky”
“Didn't work”
“then leaked out while spraying”
“Not easy to use”
“made an absolute mess”
“Too expensive”
“does not expand at all”
Top return reasons
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.