stain blocker paint
Skip itSoft demand (-22.7% this quarter) — this niche doesn't clear our bar today.
Returns
Incredible0.8%return rate — above 5% kills the launch gate
Conversion
Great10.9%search→purchase rate — share of searches ending in a sale
Price range
Good£6.37–£27.66cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Good£12.91avg listing price — sweet spot $15–$100
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Market size
Good£278K£278K/yr · 198K searches
Review moat
Okay1,604avg incumbent reviews — the moat a new listing must climb
Competition
Okay68%top-5 click share — leaders hold, buyers still browse
Brand share
Bad92%top-5 brand share — brand-locked demand
Growth
Bad-22.7%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, stain blocker paint is a £278K/yr Amazon United Kingdom market (198K searches/yr). The top 5 brands hold 92% of demand. Verdict: Skip it — 48/100.
Data updated Jul 22, 2026 · scored weekly · How we score niches
stain blocker paint market data
- Units sold / yr
- 15K–20K
- avg 750–1,000/product
- Revenue / yr
- £194K–£258K
- units × avg price
- Conversion rate
- 10.9%
- Avg BSR
- #91
- Page quality
- 0%
- Prime
- 84%
- Sponsored
- 84%
- Out of stock
- 1.1%
- Avg brand age
- 71 months
- Avg seller age
- 169 days
Competition & brand share
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.Brands
9 flat
Sellers
76
Top-5 brand share
92%
Top 20: 100%
Top-5 click share
68%
Top 20: 100%
Open market
5%
- Zinsser39%
- RUSTINS28%
- Polar Specialist Coatings16%
- Everbuild5%
- Pro-Kleen3%
- Polycell3%
- Open — no brand owns it (3 brands, 5%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -22.7% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.5×
Top stain blocker paint search terms
- stain blocker paint54K/yr
- zinsser cover stain37K/yr
- stain block23K/yr
- stain blocking primer14K/yr
- stain block paint11K/yr
- stain blocker9K/yr
- stain blocking paint6K/yr
- water stain cover paint7K/yr
- zinsser stain block6K/yr
- zinsser cover stain primer3K/yr
Top stain blocker paint 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
Rustins Stain Blocker & Multi-Surface Primer 250ml- Versatile All-Surface Primer for Blocking Stains and Sealing Porous Materials; Optimal for Walls Ceilings and Wood
RUSTINS£6.374.3★2,532 rev
Zinsser ZINCSP500 500 ml Cover Stain Primer/Finish Paint
Zinsser£10.064.6★933 rev
Zinsser Cover Stain 1 Litre
Zinsser£15.554.6★1,577 rev
Polar Damp & Stain Block Spray - 500ml Matt White - Covers Damp Mould Grease Nicotine & Rust Stains - Anti Mould & Damp Proof Paint for Internal Walls & Ceilings - Dries in 10 Min Low Odour
Polar Specialist Coatings£10.124.3★3,347 rev
Everbuild Stain Block Highly Pigmented Easy to Use White 400ml
Everbuild£6.514.4★4,385 rev
Newest
by launch date
Bartoline Stain Blocker Spray 400ml Matt Finish Blocks Mould Mildew Damp and Grease Stains Fast-Drying Primer or Topcoat for Walls Ceilings Plaster and Woodwork
Bartoline£8.0379 rev
Dryzone Damp Proof & Damp Seal Paint White (500ml) for Walls Bathrooms Ceilings & Interior Surfaces Blocks Damp Mould & Stains - Quick Drying Matt Undercoat Paint
Dryzone£14.21312 rev
Pro-Kleen Damp & Stain Block Spray Paint Primer White Matt 400ml - Covers Damp Mould Grease Nicotine & Rust Stains - for Walls & Ceilings - Leaves a Waterproof Barrier
Pro-Kleen£6.71439 rev
Polar Stain Blocker Paint - Matt White - 1 Litre | Ideal for Concrete Cement Wood Brick & Painted Surfaces | Prevents & Removes Stains Grease Water Marks & Rust on Internal Walls & Ceilings
Polar Specialist Coatings£20.14285 rev
Polar Stain Block Spray - 1 x 400ml | Matt White | Prevents & Removes Stains Grease Water Marks & Rust on Internal Walls & Ceilings | Primer Spray for Wood Plastic Tiles & Painted Surfaces
Polar Specialist Coatings£8.94416 rev
Trending
90-day click momentumPolar Stain Blocker Paint - Matt White - 1 Litre | Ideal for Concrete Cement Wood Brick & Painted Surfaces | Prevents & Removes Stains Grease Water Marks & Rust on Internal Walls & Ceilings
Polar Specialist Coatings£20.144.4★
Bartoline Stain Blocker Spray 400ml Matt Finish Blocks Mould Mildew Damp and Grease Stains Fast-Drying Primer or Topcoat for Walls Ceilings Plaster and Woodwork
Bartoline£8.034.3★
RUSTINS Stain Blocker & Multi-Surface Primer 1ltr -Versatile All-Surface Primer for Blocking Stains and Sealing Porous Materials; Optimal for Walls Ceilings and Wood
RUSTINS£13.964.3★
Zinsser BIN Primer-Sealer & Stain Killer 1 Litre
Zinsser£20.194.6★
Zinsser ZINCSP500 500 ml Cover Stain Primer/Finish Paint
Zinsser£10.064.6★
What buyers say about stain blocker paint
What buyers praise and complain about, mined from review topics.What buyers love
“Does exactly what it promises”
“Excellent product”
“Covers well”
“GOOD PAINT BUT SECURE THE LID”
“Value for money”
“Covered the water stain completely”
“Easy to use”
“Works well”
“Doesn't smell too strong”
“glad I used alot of dust sheets”
What buyers complain about
“smells very strong”
“Also not enough paint in the spray”
“Water leak through ceiling”
“One of these cans will not spray at all”
“Not as good as expected”
“Didn't work”
“Doesnt do what it says on the tin”
“There was a terrible water mafk which was dark yellow on my ceiling”
“it just dribbled out making a mess”
“Really not that good for the price”
Top return reasons
Common questions
- Is stain blocker paint profitable to sell on Amazon United Kingdom?
- The niche generates £278K/yr across 19 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -22.7%. Flapen's verdict: Skip it (48/100).
- How competitive is the stain blocker paint niche?
- 9 brands and 76 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 92% of demand.
- What do buyers complain about in stain blocker paint?
- Top complaints mined from reviews: Smell, Paint Quality, Leak-Proof. The return rate is 0.8%.
- When does demand for stain blocker paint peak?
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- What does it cost to enter the stain blocker paint niche?
- Listings span £6.37–£27.66; the average listing price is £12.91 (sweet spot $15–$100). The average incumbent carries 1,604 reviews — the moat a new listing must climb.