mastic
Skip itPrices mostly outside the sweet spot ($2.57–$10.65) — this niche doesn't clear our bar today.
Returns
Incredible0.6%return rate — above 5% kills the launch gate
Conversion
Great11.2%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Review moat
Okay2,721.63avg incumbent reviews — the moat a new listing must climb
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Competition
Okay70%top-5 click share — leaders hold, buyers still browse
Growth
Bad-6.0%90-day search growth — must beat 0% to launch
Avg price
Bad£6.94avg listing price — sweet spot $15–$100
Market size
Bad£43K£43K/yr · 56K searches
Price range
Bad£2.57–£10.65cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, mastic is a £43K/yr Amazon United Kingdom market (56K searches/yr). The top 5 brands hold 88% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 39/100.
Data updated Jul 22, 2026 · scored weekly · How we score niches
mastic market data
- Units sold / yr
- 6K–8K
- avg 250–500/product
- Revenue / yr
- £42K–£56K
- units × avg price
- Conversion rate
- 11.2%
- Avg BSR
- #95
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 88%
- Out of stock
- 0.0%
- Avg brand age
- 46 months
- Avg seller age
- 166 days
Competition & brand share
The top 5 products take 70% of clicks — established leaders, but buyers still shop beyond them.Brands
9 flat
Sellers
83
Top-5 brand share
88%
Top 20: 100%
Top-5 click share
70%
Top 20: 100%
Open market
6%
- Everbuild33%
- Unibond20%
- GORILLA16%
- EVO-STIK12%
- Sika7%
- Hemway6%
- Open — no brand owns it (3 brands, 6%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -6.0% search growth over the last 90 days.Peak months: Sep, Oct · busiest ÷ quietest = 2.2×
Top mastic search terms
- outdoor silicone sealant waterproof8K/yr
- outdoor sealant waterproof8K/yr
- silicone sealant outdoor7K/yr
- exterior silicone sealant clear5K/yr
- exterior silicone sealant5K/yr
- external sealant waterproof5K/yr
- outdoor silicone sealant7K/yr
- exterior sealant5K/yr
- clear silicone sealant waterproof outdoor5K/yr
Top mastic 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 16 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Everbuild General Purpose Silicone Sealant Waterproof Suitable for Interior and Exterior Use Clear 280ml
Everbuild£2.574.5★7,522 rev
UniBond Outdoor Window and Door Frame Sealant Premium Silicone Sealant Suitable for Use on Various Materials* Waterproof and Weather Resistant White 1 x 392g Cartridge
Unibond£7.044.5★2,314 rev
Gorilla 1144110 All Conditions Sealant Silicone Clear 295ml
GORILLA£9.024.6★5,330 rev
EVO-STIK Multipurpose Silicone Sealant Clear - Waterproof - Mould Resistant - Lasts Up To 25 Years - Interior and Exterior Use
EVO-STIK£5.274.5★1,236 rev
UniBond Outdoor Extreme Repair Sealant Polymer Based Outdoor Sealant Suitable for Use on Various Materials* Weather Resistant and Waterproof Translucent 1 x 389g Cartridge
Unibond£10.624.4★535 rev
Newest
by launch date
Gorilla Window & Door Clear Silicone Sealant 295ml Mould Resistant 100% Waterproof Sealant Rain Ready in 30 Minutes Shrink & Crack Proof Sealant | Use on Window Frames Doors & More
GORILLA£9.40451 rev
STYX Clear Sealant Waterproof Window Sealers Outdoor Sealer for Leaks Concrete Glass Metal Shower Sealant Marine Grade Aquatic Hybrid Adhesive Caulking MS Polymer Clear Adhesive 300ml
STYX£10.47115 rev
Silicone Sealant | Clear Silicone Sealant with Finishing Tool For a Smooth & Professional Finish | Waterproof & Anti-Mould Protection
ADVANCEDSIL£7.391,121 rev
All-in-One Hybrid Polymer Sealant & Adhesive - Anti-Mould Waterproof Paintable & Fast Curing (IVORY 290ml)
S4ALL PRO£5.31160 rev
Hemway Crystal Clear Construction Sealant & Adhesive 300ml - 1 Pack
Hemway£10.653,009 rev
Trending
90-day click momentumGorilla Window & Door Clear Silicone Sealant 295ml Mould Resistant 100% Waterproof Sealant Rain Ready in 30 Minutes Shrink & Crack Proof Sealant | Use on Window Frames Doors & More
GORILLA£9.404.5★
EVO-STIK Sticks Like Sh*t Waterproof Sealant Clear - 290ml - All-Purpose - Mould resistant
EVO-STIK£6.474.5★
All-in-One Hybrid Polymer Sealant & Adhesive - Anti-Mould Waterproof Paintable & Fast Curing (IVORY 290ml)
S4ALL PRO£5.314.3★
Hemway Jet Black Construction Sealant & Adhesive 300ml - 1 Pack
Hemway£8.504.4★
Everbuild General Purpose Silicone Sealant Waterproof Suitable for Interior and Exterior Use White 280ml
Sika£3.014.5★
What buyers say about mastic
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent Product”
“Decent price”
“As advertised”
“Easy to use”
“great sticky stuff”
“works really well”
“it's still waterproof”
“The colour was as described”
“Excellent sealant”
“very durable”
What buyers complain about
“Impossible to squeeze”
“Not an adhesive”
“Too thick and incredibly hard to squeeze out of tube”
“Doesnt work, dont waste your money”
“Was not very good for the job came apart in 3 days”
“Rubbish product”
“I wondered why the product was priced suspiciously cheap”
“is cream rather than white”
“not fit for purpose in my experience”
“there is a bit of an odour”
Top return reasons
Common questions
- Is mastic profitable to sell on Amazon United Kingdom?
- The niche generates £43K/yr across 16 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -6.0%. Flapen's verdict: Skip it (39/100).
- How competitive is the mastic niche?
- 9 brands and 83 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 88% of demand.
- What do buyers complain about in mastic?
- Top complaints mined from reviews: Ease Of Use, Adhesion/Stickiness, Thickness. The return rate is 0.6%.
- When does demand for mastic peak?
- Demand peaks in Sep–Oct; the busiest month runs 2.2× the quietest.
- What does it cost to enter the mastic niche?
- Listings span £2.57–£10.65; the average listing price is £6.94 (sweet spot $15–$100). The average incumbent carries 2,722 reviews — the moat a new listing must climb.