Is fence post foam profitable to sell on Amazon United States?

The niche generates $116K/yr across 18 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +38.4%. Flapen's verdict: Worth a look (51/100).

How competitive is the fence post foam niche?

10 brands and 65 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 85% of demand.

What do buyers complain about in fence post foam?

Top complaints mined from reviews: Stretchability/Expandability/Elasticity, Value For Money, Functionality-Overall. The return rate is 1.9%.

When does demand for fence post foam peak?

Demand peaks in Apr–May–Jul; the busiest month runs 3.3× the quietest.

What does it cost to enter the fence post foam niche?

Listings span $8.51–$271.48; the average listing price is $48.69 (sweet spot $15–$100). The average incumbent carries 333 reviews — the moat a new listing must climb.

fence post foam

Worth a look

Shows a sweet-spot price point ($48.69 avg), but a small market ($116K/yr) keeps it on the watch list.

Avg price

Great$48.69

avg listing price — sweet spot $15–$100

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Review moat

Great332.83

avg incumbent reviews — the moat a new listing must climb

Returns

Great1.9%

return rate — above 5% kills the launch gate

Growth

Good+38.4%

90-day search growth — must beat 0% to launch

Brand share

Okay85%

top-5 brand share — brands hold most of the demand

Price range

Okay$8.51–$271.48

cheapest to priciest tracked listing — scored on the share inside $15–$100

Conversion

Okay2.5%

search→purchase rate — share of searches ending in a sale

Competition

Okay67%

top-5 click share — leaders hold, buyers still browse

Market size

Okay$116K

$116K/yr · 96K searches

According to Flapen's Amazon United States niche tracking, fence post foam is a $116K/yr Amazon United States market (96K searches/yr). The top 5 brands hold 85% of demand. Demand peaks in Apr–May–Jul. Verdict: Worth a look — 51/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

fence post foam market data

Units sold / yr: 3K–4K; avg 100–250/product
Revenue / yr: $146K–$195K; units × avg price
Conversion rate: 2.5%
Avg BSR: #231
Page quality: 0%
Prime: 89%
Sponsored: 61%
Out of stock: 8.7%
Avg brand age: 52 months
Avg seller age: 183 days

Competition & brand share

The top 5 products take 67% of clicks — established leaders, but buyers still shop beyond them.

Brands

10 flat

Sellers

Top-5 brand share

85%

Top 20: 100%

Top-5 click share

67%

Top 20: 100%

Open market

11%

H.B. Fuller33%
KRAKEN BOND19%
STANLEY14%
POSTSAVER14%
Postloc5%
SIKA4%
Open — no brand owns it (4 brands, 11%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +38.4% search growth over the last 90 days.

Peak months: Apr, May, Jul · busiest ÷ quietest = 3.3×

Open Trend

Top fence post foam 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 18 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

H.B. Fuller Fast 2K Post Anchor Mix | Expanding Composite Footing Compound (Fence 1)

H.B. Fuller$27.494.3★1,757 rev

Kraken Bond Expanding Foam Post Hole Filler - (1x10.5 + 1x13.2 oz) 2 Part Expanding Polyurethane Concrete Alternative for Fence Deck Mailbox Anchor Waterproof Fence Post Repair Kit 1 Pack

KRAKEN BOND$22.103.9★211 rev

POSTSAVER$28.854.2★399 rev

Stanley F996 Fence Post Mix | Concrete Alternative Expanding Foam | Easy to Use Fast Installation 1x (Component A B) 12.7 fl oz and 10.1 fl oz | Includes Goggles and Gloves 2 Bottle | 1 Pack

STANLEY$22.604.2★112 rev

H.B. Fuller Fast 2K Deck Post Mix - 2 Pack | Expanding Foam Concrete Alternative for Deck Fence Mailbox & Playground Equipment Installs. Fast-Setting Post Foam

H.B. Fuller$45.924.2★438 rev

Newest

by launch date

Fast-Setting Fence Post Foam | Expanding Polyurethane Expanding Foam for Fence Posts for Fence Mailbox Deck & Anchor | Waterproof Post Hole Foams Filler | Easy Concrete Alternative Mix

YOTEBLE$15.080 rev

2mo ago

Kraken Bond Expanding Foam Post Hole Filler - (2x10.5 + 2x13.2 oz) 2 Part Expanding Polyurethane Concrete Alternative for Fence Deck Mailbox Anchor Waterproof Fence Post Repair Kit 2 Pack

KRAKEN BOND$43.27211 rev

1y ago

Stanley F996 Fence Post Mix | Concrete Alternative Expanding Foam | Easy to Use Fast Installation 1x (Component A B) 12.7 fl oz and 10.1 fl oz | Includes Goggles and Gloves 2 Bottle | 1 Pack

STANLEY$22.60112 rev

2y ago

Stanley F996 Fence Post Mix | Concrete Alternative Expanding Foam | Easy to Use Fast Installation 2X (Component A B) 12.7 fl oz and 10.1 fl oz | Includes Goggles and Gloves 2 Bottle | 2 Pack

STANLEY$44.62112 rev

2y ago

Postloc 1-Post Kit - Easy to Use Concrete Alternative (1)

Postloc$23.4497 rev

2y ago

What buyers say about fence post foam

What buyers praise and complain about, mined from review topics.

What buyers love

Ease Of Use24%

“Easy to use”

Quality-Overall15%

“Great product”

Advertised Vs Actual Product13%

“worked like advertised”

Strength11%

“Solid product”

Efficiency7%

“Works beautifully”

Functionality-Overall5%

“Effective product for limited yse”

Maintenance And Repair4%

“complete the repair job in one fell swoop”

Instructions/User Manual/Troubleshooting3%

“The instructions were clear”

Material Quality2%

“Use real concrete”

Durability2%

“Easy and Durable”

What buyers complain about

Stretchability/Expandability/Elasticity14%

“Did not expand very much”

Value For Money13%

“That cost me 30 bucks”

Functionality-Overall9%

“Doesnt work”

Quality-Overall8%

“Junk”

Instructions/User Manual/Troubleshooting8%

“Instructions are useless”

Product Condition3%

“Box was open safety glasses were used”

Hard Feel3%

“After the cement cured. hard as a rock.”

Color3%

“Would not recommend has black dye”

Safety Standards3%

“Safety of this product is questionable: Buyer Beware”

Material Quality3%

“Concrete is way to go”

Top return reasons

Functionality-Overall20%

Advertised Vs Actual Product16%

Value For Money13%

Material Quality12%

Size-Overall11%

Leak-Proof9%

Stretchability/Expandability/Elasticity4%

Instructions/User Manual/Troubleshooting3%

Compatibility-Overall1%

Water Resistance1%

Common questions

Is fence post foam profitable to sell on Amazon United States?: The niche generates $116K/yr across 18 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +38.4%. Flapen's verdict: Worth a look (51/100).
How competitive is the fence post foam niche?: 10 brands and 65 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 85% of demand.
What do buyers complain about in fence post foam?: Top complaints mined from reviews: Stretchability/Expandability/Elasticity, Value For Money, Functionality-Overall. The return rate is 1.9%.
When does demand for fence post foam peak?: Demand peaks in Apr–May–Jul; the busiest month runs 3.3× the quietest.
What does it cost to enter the fence post foam niche?: Listings span $8.51–$271.48; the average listing price is $48.69 (sweet spot $15–$100). The average incumbent carries 333 reviews — the moat a new listing must climb.

fence post foam

fence post foam market data

Competition & brand share

Demand & seasonality

Top fence post foam search terms