waterproof sealant spray
Skip itSoft demand (-68.3% this quarter) — this niche doesn't clear our bar today.
Returns
Incredible0.8%return rate — above 5% kills the launch gate
Quality gap
Great4.1★avg incumbent rating — lower means beatable quality
Conversion
Great8.4%search→purchase rate — share of searches ending in a sale
Brand share
Okay76%top-5 brand share — brands hold most of the demand
Review moat
Okay1,928.21avg incumbent reviews — the moat a new listing must climb
Competition
Okay69%top-5 click share — leaders hold, buyers still browse
Avg price
Okay£9.14avg listing price — sweet spot $15–$100
Market size
Bad£82K£82K/yr · 106K searches
Price range
Bad£4.14–£16.36cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Bad-68.3%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, waterproof sealant spray is a £82K/yr Amazon United Kingdom market (106K searches/yr). The top 5 brands hold 76% of demand. Verdict: Skip it — 43/100.
Data updated Jul 22, 2026 · scored weekly · How we score niches
waterproof sealant spray market data
- Units sold / yr
- 6K–8K
- avg 250–500/product
- Revenue / yr
- £55K–£73K
- units × avg price
- Conversion rate
- 8.4%
- Avg BSR
- #330
- Page quality
- 0%
- Prime
- 89%
- Sponsored
- 84%
- Out of stock
- 4.8%
- Avg brand age
- 47 months
- Avg seller age
- 172 days
Competition & brand share
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.Brands
13 falling
Sellers
134
Top-5 brand share
76%
Top 20: 100%
Top-5 click share
69%
Top 20: 100%
Open market
19%
- GORILLA19%
- Polar Specialist Coatings19%
- Pro-Kleen15%
- 1ABOVE12%
- JENOLITE11%
- 1516%
Demand
Weekly Amazon search volume, last 34 weeks — -68.3% search growth over the last 90 days.Top waterproof sealant spray search terms
- waterproof sealant spray19K/yr
- flex seal spray8K/yr
- sealant spray6K/yr
- spray sealant for water leaks7K/yr
- stop leak spray6K/yr
- spray sealant5K/yr
- leak sealer spray5K/yr
- leak repair waterproof sealant spray23K/yr
- water sealant spray3K/yr
- roof sealant spray5K/yr
Top waterproof sealant spray 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 19 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Gorilla Waterproof Black Coat & Seal Spray 450ml Flexible Weatherproof Liquid Sealant | Seals out Water Air & Moisture | For Roof Tiles Brick Wood Metal Concrete Stone Rubber Plastics*
GORILLA£13.394.4★519 rev
Polar Leak Fix Waterproof Sealant Spray 400ml Clear
Polar Specialist Coatings£10.744.1★4,576 rev
Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs Pipes Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)
Pro-Kleen£9.504.2★972 rev
1ABOVE 400ml Waterproof Leak Sealant Spray for Roofs & Pipes
1ABOVE£5.814.3★126 rev
JENOLITE Stop Leak Sealer Spray | CLEAR | 400ml | Leak Sealer for Gutters and Flat Roofs | Waterproof Gutter Sealant | Fills Seals & Stops Leaks | Long Lasting Waterproof Sealant
JENOLITE£10.574.0★7,744 rev
Newest
by launch date
Leak Repair Waterproof Sealant Cream Fast Drying Sealant Spray Leak Repair Cream Roof Sealan/t Long-Lasting Seal Spray Waterproof Crea/m for Roofs Pipes Crack Canned Filler Crea/m for Wall with Brush
Gerhua£8.2628 rev
Bartoline Leak Sealer Clear 400ml Premium Transparent Waterproof Spray Sealant for Instant Repairs Weatherproof Durable & Overpaintable
Bartoline£9.2350 rev
Gorilla Waterproof Coat & Seal Clear 473ml - Weatherproof Liquid Sealant | Stops & Prevents Leaks | For Roof Tiles Brick Wood Metal Concrete Stone Rubber Plastics*
GORILLA£12.342,353 rev
Gorilla Waterproof Black Coat & Seal Spray 450ml Flexible Weatherproof Liquid Sealant | Seals out Water Air & Moisture | For Roof Tiles Brick Wood Metal Concrete Stone Rubber Plastics*
GORILLA£13.39519 rev
300g Invisible Waterproof Agent Transparent Insulation Sealant Clear Waterproof Coating Agent Anti-leakage Repair Spray Glue Grout Sealer for Outdoor Home Bathroom Toilet Gutter
LYINUR£7.95601 rev
Trending
90-day click momentum
Grangers Footwear Repel Plus | 275ml | Powerful Spray-On Proofer For All Walking Boots & Outdoor Footwear
Granger's£8.174.4★
151 Stop That Leak Repair Spray
151£4.673.9★
Gorilla Waterproof Coat & Seal Clear 473ml - Weatherproof Liquid Sealant | Stops & Prevents Leaks | For Roof Tiles Brick Wood Metal Concrete Stone Rubber Plastics*
GORILLA£12.344.5★
1ABOVE 400ml Waterproof Leak Sealant Spray for Roofs & Pipes
1ABOVE£5.814.3★
Bartoline Leak Sealer Clear 400ml Premium Transparent Waterproof Spray Sealant for Instant Repairs Weatherproof Durable & Overpaintable
Bartoline£9.234.2★
What buyers say about waterproof sealant spray
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product”
“As described”
“No more leaks”
“Easy to use”
“Fair price”
“Worked great”
“Waterproof”
“cant believe how well it work one spray”
“Really sticky and does the job well”
“Very strong”
What buyers complain about
“Leaking pipe”
“Doesnt do what it says it should do”
“Not cheap,”
“not fit for purpose”
“Absolute rubbish”
“Didn't work and only resulted in making an area sticky until dry where a coat of shine was put on”
“Wouldnt spray”
“product is black”
“Product very misleading and poor”
“Its just like black spray paint”
Top return reasons
Common questions
- Is waterproof sealant spray profitable to sell on Amazon United Kingdom?
- The niche generates £82K/yr across 19 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -68.3%. Flapen's verdict: Skip it (43/100).
- How competitive is the waterproof sealant spray niche?
- 13 brands and 134 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 76% of demand.
- What do buyers complain about in waterproof sealant spray?
- Top complaints mined from reviews: Leak-Proof, Functionality-Overall, Value For Money. The return rate is 0.8%.
- What does it cost to enter the waterproof sealant spray niche?
- Listings span £4.14–£16.36; the average listing price is £9.14 (sweet spot $15–$100). The average incumbent carries 1,928 reviews — the moat a new listing must climb.