---
title: "Mastic — £43K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/diy-tools/mastic"
last_updated: "2026-07-31T12:33:18.846Z"
locale: en
meta:
description: "Niche score 39/100 · £43K/yr market · 56K searches/yr · £6.94 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 39/100 · £43K/yr market · 56K searches/yr · £6.94 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Mastic — £43K/yr Amazon UK Niche (2026) - Flapen"
---
# **mastic**
**Skip it**
Prices mostly outside the sweet spot ($2.57–$10.65) — this niche doesn't clear our bar today.
Market size 11Growth 22Conversion 92Competition 26Returns 97Price range 0Avg price 19Brand share 28Review moat 38Quality gap 60
**Returns**
**Incredible****0.6%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****11.2%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****2,721.63**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****88%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****70%**
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****£6.94**
avg listing price — sweet spot $15–$100
**Market size**
**Bad****£43K**
£43K/yr · 56K searches
**Price range**
**Bad****£2.57–£10.65**
cheapest 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 ~~](https://flapen.com/research/methodology)
## **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.
3K2KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 2.2×
[**Open Trend **](https://flapen.com/research/uk/diy-tools/mastic/trend)
## **Top mastic search terms**
- **outdoor silicone sealant waterproof**8K/yr+40.7%9.2% conv. - **outdoor sealant waterproof**8K/yr+10.4%8.0% conv. - **silicone sealant outdoor**7K/yr-0.3%10.9% conv. - **exterior silicone sealant clear**5K/yr+35.6%11.1% conv. - **exterior silicone sealant**5K/yr-49.4%6.5% conv. - **external sealant waterproof**5K/yr-27.2%8.0% conv. - **outdoor silicone sealant**7K/yr-20.8%7.9% conv. - **exterior sealant**5K/yr-24.4%4.2% conv. - **clear silicone sealant waterproof outdoor**5K/yr-24.5%16.0% conv. [**All search terms **](https://flapen.com/research/uk/diy-tools/mastic/search-terms)
## **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.
0%10%£4K20%£9K30%£13K40%£17K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Everbuild General Purpose Silicone Sealant Waterproof Suitable for Interior and Exterior Use Clear 280ml**Everbuild**£2.57**4.5★7,522 rev](https://www.amazon.co.uk/dp/B004F1VINS) [2**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**£7.04**4.5★2,314 rev](https://www.amazon.co.uk/dp/B01G3OC9FU) [3**Gorilla 1144110 All Conditions Sealant Silicone Clear 295ml**GORILLA**£9.02**4.6★5,330 rev](https://www.amazon.co.uk/dp/B07S19ZXRC) [4**EVO-STIK Multipurpose Silicone Sealant Clear - Waterproof - Mould Resistant - Lasts Up To 25 Years - Interior and Exterior Use**EVO-STIK**£5.27**4.5★1,236 rev](https://www.amazon.co.uk/dp/B0041WB7G4) [5**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**£10.62**4.4★535 rev](https://www.amazon.co.uk/dp/B0BZD7VWS6)
**~~View all top sellers →~~**
### **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**£9.40**451 rev1mo ago](https://www.amazon.co.uk/dp/B0GZQPW82X) [**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**£10.47**115 rev1y ago](https://www.amazon.co.uk/dp/B0FH7KLB42) [**Silicone Sealant | Clear Silicone Sealant with Finishing Tool For a Smooth & Professional Finish | Waterproof & Anti-Mould Protection**ADVANCEDSIL**£7.39**1,121 rev1y ago](https://www.amazon.co.uk/dp/B0F9Y5SD4G) [**All-in-One Hybrid Polymer Sealant & Adhesive - Anti-Mould Waterproof Paintable & Fast Curing (IVORY 290ml)**S4ALL PRO**£5.31**160 rev1y ago](https://www.amazon.co.uk/dp/B0F9PRV7H7) [**Hemway Crystal Clear Construction Sealant & Adhesive 300ml - 1 Pack**Hemway**£10.65**3,009 rev2y ago](https://www.amazon.co.uk/dp/B0CPLZNNL7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**£9.40**4.5★**▲ 316%**](https://www.amazon.co.uk/dp/B0GZQPW82X) [**EVO-STIK Sticks Like Sh*t Waterproof Sealant Clear - 290ml - All-Purpose - Mould resistant**EVO-STIK**£6.47**4.5★**▲ 114%**](https://www.amazon.co.uk/dp/B01D8GQ11O) [**All-in-One Hybrid Polymer Sealant & Adhesive - Anti-Mould Waterproof Paintable & Fast Curing (IVORY 290ml)**S4ALL PRO**£5.31**4.3★**▲ 92%**](https://www.amazon.co.uk/dp/B0F9PRV7H7) [**Hemway Jet Black Construction Sealant & Adhesive 300ml - 1 Pack**Hemway**£8.50**4.4★**▲ 59%**](https://www.amazon.co.uk/dp/B0CPLZ5L2Q) [**Everbuild General Purpose Silicone Sealant Waterproof Suitable for Interior and Exterior Use White 280ml**Sika**£3.01**4.5★**▲ 31%**](https://www.amazon.co.uk/dp/B000OLDX4U)
**~~View all trending →~~**
## **What buyers say about mastic**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**24%
*“Excellent Product”*
**Value For Money**17%
*“Decent price”*
**Advertised Vs Actual Product**12%
*“As advertised”*
**Ease Of Use**9%
*“Easy to use”*
**Adhesion/Stickiness**8%
*“great sticky stuff”*
**Efficiency**5%
*“works really well”*
**Water Resistance**5%
*“it's still waterproof”*
**Color**2%
*“The colour was as described”*
**Leak-Proof**2%
*“Excellent sealant”*
**Durability**2%
*“very durable”*
### **What buyers complain about **
**Ease Of Use**24%
*“Impossible to squeeze”*
**Adhesion/Stickiness**7%
*“Not an adhesive”*
**Thickness**7%
*“Too thick and incredibly hard to squeeze out of tube”*
**Functionality-Overall**4%
*“Doesnt work, dont waste your money”*
**Durability**4%
*“Was not very good for the job came apart in 3 days”*
**Quality-Overall**4%
*“Rubbish product”*
**Value For Money**4%
*“I wondered why the product was priced suspiciously cheap”*
**Color**4%
*“is cream rather than white”*
**Size-Overall**3%
*“not fit for purpose in my experience”*
**Smell**2%
*“there is a bit of an odour”*
### **Top return reasons **
**Color**45%
**Functionality-Overall**9%
**Ease Of Use**6%
**Adhesion/Stickiness**5%
**Defective Material/Parts**4%
**Size-Overall**4%
**Advertised Vs Actual Product**4%
**Leak-Proof**4%
**Quality-Overall**3%
**Compatibility-Overall**2%
## **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.
## **Related niches in DIY & Tools**
- 68 [**cardboard cutter**](https://flapen.com/research/uk/diy-tools/cardboard-cutter)£343K/yr+30.6%**Worth a look**- 68 [**door canopy**](https://flapen.com/research/uk/diy-tools/door-canopy)£202K/yr+187.7%**Worth a look**- 68 [**fence post repair**](https://flapen.com/research/uk/diy-tools/fence-post-repair)£359K/yr-8.2%**Worth a look**- 68 [**cat window guard**](https://flapen.com/research/uk/diy-tools/cat-window-guard)£98K/yr+413.1%**Worth a look**- 68 [**sun shade**](https://flapen.com/research/uk/diy-tools/sun-shade)£202K/yr+187.7%**Worth a look**- 69 [**brass hose connector**](https://flapen.com/research/uk/diy-tools/brass-hose-connector)£66K/yr+122.8%**Worth a look**[**All DIY & Tools niches **](https://flapen.com/research/uk/diy-tools)