caulk
Skip itPrices mostly outside the sweet spot ($2.11–$14.07) — this niche doesn't clear our bar today.
Conversion
Incredible17.9%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.2%return rate — above 5% kills the launch gate
Market size
Good£556K£556K/yr · 468K searches
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Review moat
Okay1,822.56avg incumbent reviews — the moat a new listing must climb
Avg price
Bad£6.64avg listing price — sweet spot $15–$100
Growth
Bad-20.0%90-day search growth — must beat 0% to launch
Competition
Bad84%top-5 click share — a locked-up shelf
Brand share
Bad97%top-5 brand share — brand-locked demand
Price range
Bad£2.11–£14.07cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, caulk is a £556K/yr Amazon United Kingdom market (468K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in Feb. Verdict: Skip it — 43/100.
Data updated Jul 22, 2026 · scored weekly · How we score niches
caulk market data
- Units sold / yr
- 80K–100K
- avg 8,000–10,000/product
- Revenue / yr
- £531K–£664K
- units × avg price
- Conversion rate
- 17.9%
- Avg BSR
- #116
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 67%
- Out of stock
- 0.0%
- Avg brand age
- 42 months
- Avg seller age
- 172 days
Competition & brand share
The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.Brands
6 falling
Sellers
57
Top-5 brand share
97%
Top 20: 100%
Top-5 click share
84%
Top 20: 100%
Open market
0%
- Everbuild46%
- Soudal27%
- EETU11%
- EVO-STIK7%
- Sika5%
- Siroflex3%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -20.0% search growth over the last 90 days.Peak months: Feb · busiest ÷ quietest = 1.8×
Top caulk search terms
- caulk176K/yr
- decorators caulk white134K/yr
- decorators caulk46K/yr
- caulk white21K/yr
- caulking15K/yr
- white caulk10K/yr
- decorators caulk white paintable8K/yr
- chaulk6K/yr
- calk sealant7K/yr
- painters mate7K/yr
Top caulk 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 9 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Sika Caulk Once Premium Quality Acrylic Caulk Highly Flexible Fast Drying White 295ml
Everbuild£2.604.5★11,812 rev
Pack of 2 Soudal Decorator Caulk Gap & Crack Filler Acrylic Silcone Adhesive Sealant
Soudal£5.304.6★1,007 rev
EVO-STIK Decorators Caulk White - 280ml - Low-Movement Crack and Gap Filler - Fast-Drying - Can be Overpainted - Easy-to-Apply - Lasts Up To 15 Years
EVO-STIK£3.334.4★56 rev
Decorators Caulk White Set - Bundle With Sealant Gun Silicone Tool Smoothing Set And White Caulk Gap And Crack Filler Acrylic Silicone Adhesive Sealant
EETU£14.074.0★164 rev
Soudal Decorators Caulk Acrylic Gap & Crack Filler Silicone Sealant (x6)
Soudal£9.834.7★328 rev
Newest
by launch dateDecorators Caulk White Set - Bundle With Sealant Gun Silicone Tool Smoothing Set And White Caulk Gap And Crack Filler Acrylic Silicone Adhesive Sealant
EETU£14.07164 rev
Decorators Caulk White Set with Sealant Gun & Smoothing Tool
EETU£11.5574 rev
Pack of 2 Soudal Decorator Caulk Gap & Crack Filler Acrylic Silcone Adhesive Sealant
Soudal£5.301,007 rev
Pack of 3 Soudal Decorator Caulk Gap & Crack Filler Acrylic Silcone Adhesive Sealant
Soudal£6.331,051 rev
Soudal Decorators Caulk Acrylic Gap & Crack Filler Silicone Sealant (x6)
Soudal£9.83328 rev
Trending
90-day click momentumEVO-STIK Decorators Caulk White - 280ml - Low-Movement Crack and Gap Filler - Fast-Drying - Can be Overpainted - Easy-to-Apply - Lasts Up To 15 Years
EVO-STIK£3.334.4★
Pack of 3 Soudal Decorator Caulk Gap & Crack Filler Acrylic Silcone Adhesive Sealant
Soudal£6.334.5★
SikaSeal One Hour Caulk (Previously Everflex 125) White 300 ml
Sika£2.114.5★
Sika Caulk Once Premium Quality Acrylic Caulk Highly Flexible Fast Drying White 295ml
Everbuild£2.604.5★
Decorators Caulk White Set - Bundle With Sealant Gun Silicone Tool Smoothing Set And White Caulk Gap And Crack Filler Acrylic Silicone Adhesive Sealant
EETU£14.074.0★
What buyers say about caulk
What buyers praise and complain about, mined from review topics.What buyers love
“Good smooth quality”
“Great value”
“Did the job”
“Easy to use”
“Easy to apply and great finish”
“Did the job that it was intended for, great adhesion”
“Dries hard and paints over really easily”
“Dried quickly”
“Flows well”
“Caulk is good standard crisp white in colour”
What buyers complain about
“Cheapest i could find excellent quality”
“Overall this is no better than the cheaper alternatives in my opinion”
“Hard to use”
“One of the tubes I bought was faulty”
“This means it shows as a different texture when painted is therefore clearly visible”
“Doesnt look like the picture”
“bubbly because it leaks out both ends”
“its very fragile”
“Couldnt even do the job we bought it for”
“It also cracks very badly after even a few weeks”
Top return reasons
Common questions
- Is caulk profitable to sell on Amazon United Kingdom?
- The niche generates £556K/yr across 9 tracked products. 90-day search growth is -20.0%. Flapen's verdict: Skip it (43/100).
- How competitive is the caulk niche?
- 6 brands and 57 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 97% of demand.
- What do buyers complain about in caulk?
- Top complaints mined from reviews: Quality-Overall, Value For Money, Ease Of Use. The return rate is 0.2%.
- When does demand for caulk peak?
- Demand peaks in Feb; the busiest month runs 1.8× the quietest.
- What does it cost to enter the caulk niche?
- Listings span £2.11–£14.07; the average listing price is £6.64 (sweet spot $15–$100). The average incumbent carries 1,823 reviews — the moat a new listing must climb.