Mastic
FailPrices span $2.57–$10.65, mostly outside the sweet spot, so Mastic is a Fail.
- Flapen Score
- 39 / 100Ranks 1,901 of 2,225 DIY & Tools niches · −10 vs the category median of 4939
- Market size
- £43K/yr56K searches / yr
- 90-day growth
- -6.0%search demand this quarter
- Competition
- 70%top-5 click share · 9 brands · 83 sellers
Flapen Score
Mastic against its category
The dotted line is the DIY & Tools average. Past it, Mastic is stronger. Inside it, weaker.
Market
The Mastic market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for Mastic 56K times last year and spent an estimated £43K. The top 5 brands take 88% of clicks. Demand peaks in Sep–Oct. Flapen scores it 39 out of 100, a Fail.
01 · Demand
An estimated 11.2% of those searches ended in a purchase.
Shoppers searched for this 56K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 11.2% of those searches ended in a purchase. Searches in the last 90 days moved -6.0% against the 90 days before. Searches, conversion and average price together put the market at an estimated £43K a year.
- Searches, last 12 months
- 56K
- Growth, 90 days vs prior 90
- -6.0%
- Conversion, latest week
- 11.2%
- Market size, estimated
- £43Ka year
- Peak month
- September2.2× the quietest month
- Top search term
- outdoor silicone sealant waterproof8K searches a year
02 · Price
A sale here is worth £6.94.
Listings sell for £6.94 on average, from £2.57 to £10.65. Amazon reports units sold in ranges. This niche sold 6K to 8K a year. The average listing sells 250 to 500 of them. At £6.94 that is £2K to £3K a year per listing.
- Average price
- £6.94under the $15 to $100 sweet spot
- Price range
- £2.57–£10.65
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 6K–8K
- Units per listing a year
- 250–500
- Revenue per listing a year
- £2K–£3K
- Returns
- 0.6%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is reviews.
88% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #95 within Adhesives & Sealers. It carries 2,722 reviews at 4.39 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 88%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #95in Adhesives & Sealers
- Average rating
- 4.39 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 2,722per listing
- Listings tracked
- 16
04 · Newcomers
0 of last year's 1 launches cleared the first-year sales bar.
1 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 46 months on average, so the names here are settling in.
- Launched, last 12 months
- 1
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 46 months
Products
Top Mastic products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 22, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Everbuild General Purpose Silicone Sealant Waterproof Suitable for Interior and Exterior Use Clear 280ml
- Price
- £2.57
- Rating
- 4.5/5
- Reviews
- 7,522
- Age
- 19y ago

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
- Price
- £7.04
- Rating
- 4.5/5
- Reviews
- 2,314
- Age
- 10y ago

Gorilla 1144110 All Conditions Sealant Silicone Clear 295ml
- Price
- £9.02
- Rating
- 4.6/5
- Reviews
- 5,330
- Age
- 7y ago

EVO-STIK Multipurpose Silicone Sealant Clear - Waterproof - Mould Resistant - Lasts Up To 25 Years - Interior and Exterior Use
- Price
- £5.27
- Rating
- 4.5/5
- Reviews
- 1,236
- Age
- 19y ago

UniBond Outdoor Extreme Repair Sealant Polymer Based Outdoor Sealant Suitable for Use on Various Materials* Weather Resistant and Waterproof Translucent 1 x 389g Cartridge
- Price
- £10.62
- Rating
- 4.4/5
- Reviews
- 535
- Age
- 3y ago
Trending
estimated 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
- Price
- £9.40
- Rating
- 4.5/5
- Reviews
- 451
- Age
- 1mo ago

EVO-STIK Sticks Like Sh*t Waterproof Sealant Clear - 290ml - All-Purpose - Mould resistant
- Price
- £6.47
- Rating
- 4.5/5
- Reviews
- 1,127
- Age
- 10y ago

All-in-One Hybrid Polymer Sealant & Adhesive - Anti-Mould Waterproof Paintable & Fast Curing (IVORY 290ml)
- Price
- £5.31
- Rating
- 4.3/5
- Reviews
- 160
- Age
- 1y ago

Hemway Jet Black Construction Sealant & Adhesive 300ml - 1 Pack
- Price
- £8.50
- Rating
- 4.4/5
- Reviews
- 3,009
- Age
- 2y ago

Everbuild General Purpose Silicone Sealant Waterproof Suitable for Interior and Exterior Use White 280ml
- Price
- £3.01
- Rating
- 4.5/5
- Reviews
- 7,891
- Age
- 19y ago
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
- Price
- £9.40
- Rating
- 4.5/5
- Reviews
- 451
- Age
- 1mo ago

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
- Price
- £10.47
- Rating
- 4.3/5
- Reviews
- 115
- Age
- 1y ago

Silicone Sealant | Clear Silicone Sealant with Finishing Tool For a Smooth & Professional Finish | Waterproof & Anti-Mould Protection
- Price
- £7.39
- Rating
- 4.0/5
- Reviews
- 1,121
- Age
- 1y ago

All-in-One Hybrid Polymer Sealant & Adhesive - Anti-Mould Waterproof Paintable & Fast Curing (IVORY 290ml)
- Price
- £5.31
- Rating
- 4.3/5
- Reviews
- 160
- Age
- 1y ago

Hemway Crystal Clear Construction Sealant & Adhesive 300ml - 1 Pack
- Price
- £10.65
- Rating
- 4.4/5
- Reviews
- 3,009
- Age
- 2y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 70% of clicks. Leaders hold, but buyers still shop past them.
Brands
9 flat
Sellers
83
Est. top-5 brand share
88%
Top 20: 100%
Est. 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
Mastic search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Sep, Oct · busiest ÷ quietest = 2.2×
Search terms
Top Mastic search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- 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
Reviews and returns
What reviews say buyers love and hate about Mastic
We read the reviews and the return reasons for every product selling here.
“Impossible to squeeze”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
16 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Mastic questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data








