duct seal
Worth a lookShows low returns (1.1%), but brand-locked demand (top 5 brands take 97% of clicks) keeps it on the watch list.
Returns
Great1.1%return rate — above 5% kills the launch gate
Conversion
Great11.2%search→purchase rate — share of searches ending in a sale
Avg price
Great$15.00avg listing price — sweet spot $15–$100
Growth
Good+55.8%90-day search growth — must beat 0% to launch
Review moat
Good1,086avg incumbent reviews — the moat a new listing must climb
Price range
Good$4.55–$28.78cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Good$323K$323K/yr · 192K searches
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Competition
Bad81%top-5 click share — a locked-up shelf
Brand share
Bad97%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, duct seal is a $323K/yr Amazon United States market (192K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in Jun–Jul. Verdict: Worth a look — 52/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
duct seal market data
- Units sold / yr
- 25K–30K
- avg 3,000–4,000/product
- Revenue / yr
- $375K–$450K
- units × avg price
- Conversion rate
- 11.2%
- Avg BSR
- #70
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 82%
- Out of stock
- 0.0%
- Avg brand age
- 53 months
- Avg seller age
- 153 days
Competition & brand share
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.Brands
6 flat
Sellers
41
Top-5 brand share
97%
Top 20: 100%
Top-5 click share
81%
Top 20: 100%
Open market
0%
- Rectorseal52%
- Red Devil29%
- Gardner Bender9%
- Ideal Industries4%
- E/FUSING3%
- GOODJDNX3%
- Open — no brand owns it (0%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +55.8% search growth over the last 90 days.Peak months: Jun, Jul · busiest ÷ quietest = 2.0×
Top duct seal search terms
- duct seal45K/yr
- duct seal putty32K/yr
- duct sealant19K/yr
- mastic duct sealant11K/yr
- duct mastic8K/yr
- electrical putty10K/yr
- duct seal compound7K/yr
- hvac sealant6K/yr
- duct putty5K/yr
- hvac putty5K/yr
Top duct seal 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 11 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
RectorSeal Duct Seal 81880 Compound Easily Applied to Plumbing & Metal Fabrication Paintable General Purpose Sealant 1 lb
Rectorseal$5.004.7★1,842 rev
Red Devil 0841DX F-Seal 181 Duct Seal Fiber Reinforced Water Based Duct Sealant 1 Gallon Gray Made in USA
Red Devil$24.834.5★1,547 rev
Red Devil 0841DW F-Seal 181 Fiber Reinforced Water Based Duct Sealant 1 Gallon White
Red Devil$28.784.5★1,547 rev
Gardner Bender DS-110N 1-Pound Duct Seal Compound
Gardner Bender$4.554.6★406 rev
Red Devil 0841DS RD-DS 181 Acrylic Latex Duct Sealant 1/2 Gallon Gray
Red Devil$26.124.6★622 rev
Newest
by launch date
GOODJDNX Duct Seal Putty 12 Pack Moldable Gap Filler for Wall & Pipe Gaps Non-Hardening Blocks Drafts for HVAC Openings & Electrical Entry Holes Seal Compound 30g Each
GOODJDNX$18.9310 rev
900 Moldable Silicone Putty - Gray Rectangular Shape
E/FUSING$13.631,732 rev
Red Devil 0841DW F-Seal 181 Fiber Reinforced Water Based Duct Sealant 1 Gallon White
Red Devil$28.781,547 rev
Red Devil 0841DX F-Seal 181 Duct Seal Fiber Reinforced Water Based Duct Sealant 1 Gallon Gray Made in USA
Red Devil$24.831,547 rev
Red Devil 0846DX F Seal 181 Fiber Reinforced Water Based Duct Sealant 10.1 oz. Gray 1 Pack
Red Devil$7.821,547 rev
Trending
90-day click momentumGOODJDNX Duct Seal Putty 12 Pack Moldable Gap Filler for Wall & Pipe Gaps Non-Hardening Blocks Drafts for HVAC Openings & Electrical Entry Holes Seal Compound 30g Each
GOODJDNX$18.935.0★
Red Devil 0841DW F-Seal 181 Fiber Reinforced Water Based Duct Sealant 1 Gallon White
Red Devil$28.784.5★
Red Devil 0846DX F Seal 181 Fiber Reinforced Water Based Duct Sealant 10.1 oz. Gray 1 Pack
Red Devil$7.824.5★
Red Devil 0841DS RD-DS 181 Acrylic Latex Duct Sealant 1/2 Gallon Gray
Red Devil$26.124.6★
Gardner Bender DS-110N 1-Pound Duct Seal Compound
Gardner Bender$4.554.6★
What buyers say about duct seal
What buyers praise and complain about, mined from review topics.What buyers love
“was easy to use”
“Worked as advertised”
“feels durable”
“Good for air and water sealing”
“Great product”
“Great value”
“Sticks”
“it worked great”
“I have to say its incredibly versatile”
“great quantity for service techs”
What buyers complain about
“The lid was not closed properly and the contents leaked and dried out”
“It doesn't smell much. if at all”
“Product was deficient on the 2nd order”
“This product didnt stick to anything other than my gloved hands”
“lease are very picky about what repairs are allowed”
“Waste of time and money”
“Not effective at all”
“false ad, not what was indicated”
“the bucket was a mess, full of product that leaked out and inside was some dried up towards the top where it was open”
“It's very thick”
Top return reasons
Common questions
- Is duct seal profitable to sell on Amazon United States?
- The niche generates $323K/yr across 11 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +55.8%. Flapen's verdict: Worth a look (52/100).
- How competitive is the duct seal niche?
- 6 brands and 41 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 97% of demand.
- What do buyers complain about in duct seal?
- Top complaints mined from reviews: Leak-Proof, Smell, Quality-Overall. The return rate is 1.1%.
- When does demand for duct seal peak?
- Demand peaks in Jun–Jul; the busiest month runs 2.0× the quietest.
- What does it cost to enter the duct seal niche?
- Listings span $4.55–$28.78; the average listing price is $15.00 (sweet spot $15–$100). The average incumbent carries 1,086 reviews — the moat a new listing must climb.