Is cosmoline profitable to sell on Amazon United States?

The niche generates $92K/yr across 19 tracked products. 3 of 4 products launched in the last 360 days are still selling. 90-day search growth is +7.2%. Flapen's verdict: Skip it (46/100).

How competitive is the cosmoline niche?

13 brands and 101 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 69% of demand.

What do buyers complain about in cosmoline?

Top complaints mined from reviews: Rusts/Corrodes, Value For Money, Adhesion/Stickiness. The return rate is 1.1%.

When does demand for cosmoline peak?

Demand peaks in Apr–Oct; the busiest month runs 2.0× the quietest.

What does it cost to enter the cosmoline niche?

Listings span $14.22–$168.09; the average listing price is $74.08 (sweet spot $15–$100). The average incumbent carries 457 reviews — the moat a new listing must climb.

cosmoline

Skip it

A small market ($92K/yr) — this niche doesn't clear our bar today.

Returns

Great1.1%

return rate — above 5% kills the launch gate

Avg price

Great$74.08

avg listing price — sweet spot $15–$100

Review moat

Great457

avg incumbent reviews — the moat a new listing must climb

Brand share

Good69%

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

Price range

Good$14.22–$168.09

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

Conversion

Okay3.4%

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

Competition

Okay64%

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

Growth

Okay+7.2%

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

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Market size

Bad$92K

$92K/yr · 37K searches

Signals Low Review Barrier High Price

According to Flapen's Amazon United States niche tracking, cosmoline is a $92K/yr Amazon United States market (37K searches/yr). The top 5 brands hold 69% of demand. Demand peaks in Apr–Oct. Verdict: Skip it — 46/100.

Data updated Jul 8, 2026 · scored weekly · How we score niches

cosmoline market data

Units sold / yr: 1K–2K; avg 100–250/product
Revenue / yr: $93K–$111K; units × avg price
Conversion rate: 3.4%
Avg BSR: #359
Page quality: 0%
Prime: 53%
Sponsored: 74%
Out of stock: 3.9%
Avg brand age: 74 months
Avg seller age: 177 days

Competition & brand share

The top 5 products take 64% of clicks — established leaders, but buyers still shop beyond them.

Brands

13 rising

Sellers

101

Top-5 brand share

69%

Top 20: 100%

Top-5 click share

64%

Top 20: 100%

Open market

23%

APOWUS21%
FraFr.gancia18%
Cosmoline Direct, LLC11%
RP Military-Grade Rust Preventatives10%
CRC9%
TEAYIR8%

Demand & seasonality

Weekly Amazon search volume, last 89 weeks — +7.2% search growth over the last 90 days.

Peak months: Apr, Oct · busiest ÷ quietest = 2.0×

Open Trend

Top cosmoline search terms

cosmoline21K/yr +10.4%2.5% conv.
cosmoline rp-3425K/yr +13.4%6.0% conv.
rp-3423K/yr +4.0%4.8% conv.
cosmoline spray2K/yr +0.4%2.4% conv.
rp3422K/yr -15.1%6.7% conv.
cosmoline undercoating3K/yr -7.5%3.7% conv.

All search terms

Top cosmoline 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★)

All 19 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Cosmoline RP-342 Heavy Rust Preventative Spray (Military-Grade) 3-Cans

APOWUS$49.664.8★341 rev

Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 3-Cans

FraFr.gancia$49.824.8★322 rev

Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans

Cosmoline Direct, LLC$89.584.6★205 rev

Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 1-Can

TEAYIR$22.254.6★71 rev

Cosmoline RP-342 Heavy Rust Preventative Spray (Military-Grade) 6-Cans

RP Military-Grade Rust Preventatives$86.044.7★327 rev

Newest

by launch date

LHI 50L Tactical Duffle Bag for Men 3-in-1 Gym Duffle and Backpack Shoe Compartment Laptop Sleeve and MOLLE Carry-On Travel Weekender and Overnight Bag Black

LHI$30.12139 rev

9mo ago

STOVER Womens Convertible Garment Duffel Bag for Travel 2-in-1 Carry-On Weekender/Overnight Tote - Wrinkle-Free Dresses Suits & Clothes + Shoe Compartment & Bonus Toiletry Bag (Emerald Green)

STOVER$56.3196 rev

9mo ago

Halfday Convertible 2-in-1 Premium Garment Duffel Weekender Bag 40L: Wrinkle-Free Travel (Hanging Suit Compartment Shoe Pockets Trolley Sleeve) Balistic Nylon Carry-on Pacific

Halfday$156.90190 rev

10mo ago

Halfday Convertible 2-in-1 Premium Garment Duffel Weekender Bag 45L: Wrinkle-Free Travel (Hanging Suit Compartment Shoe Pockets Trolley Sleeve) Balistic Nylon Carry-on Ash

Halfday$168.09190 rev

11mo ago

STOVER Garment Travel Duffle Bag Large 2-in-1 Convertible Carry-on Luggage for Men & Women- Hanging Suits Dresses & Clothes + Shoe Compartment- Weekender Tote Combo Duffel (Brown Leatherette)

STOVER$60.32250 rev

2y ago

What buyers say about cosmoline

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

What buyers love

Quality-Overall20%

“It has the feel of a premium product that is very well made”

Rusts/Corrodes14%

“Rust proofing”

Value For Money11%

“Worth it”

Durability8%

“Durable and easy to use”

Storage Capacity5%

“Plenty of room”

Strength4%

“Holding up good so far”

Design-Overall4%

“Well made in terms of design, versatility and quality”

Pockets/Compartments3%

“Pretty bag with lots of pockets”

Size-Overall2%

“the perfect size”

Zipper Quality2%

“Looks great and the zippers were fairly easy”

What buyers complain about

Rusts/Corrodes13%

“Everything was beginning to rust again”

Value For Money5%

“its expensive as fuq”

Adhesion/Stickiness5%

“This stuff doesn't stick”

Color5%

“The color was darker that it looked on the web site”

Quality-Overall4%

“Is a little cheap looking”

Weight Heavy4%

“Too heavy without wheels”

Spray/Flow3%

“Not compatible with spray wands with a female can interface”

Wheel Quality3%

“One regret is not on wheels”

Advertised Vs Actual Product3%

“didnt get the flag, like it shows on picture”

Material Quality3%

“Material was fairly cheap”

Top return reasons

Size-Overall48%

Zipper Quality9%

Advertised Vs Actual Product7%

Color5%

Weight Heavy5%

Material Quality3%

Width3%

Wrong Dimensions2%

Strength2%

Shape/Style2%

Common questions

Is cosmoline profitable to sell on Amazon United States?: The niche generates $92K/yr across 19 tracked products. 3 of 4 products launched in the last 360 days are still selling. 90-day search growth is +7.2%. Flapen's verdict: Skip it (46/100).
How competitive is the cosmoline niche?: 13 brands and 101 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 69% of demand.
What do buyers complain about in cosmoline?: Top complaints mined from reviews: Rusts/Corrodes, Value For Money, Adhesion/Stickiness. The return rate is 1.1%.
When does demand for cosmoline peak?: Demand peaks in Apr–Oct; the busiest month runs 2.0× the quietest.
What does it cost to enter the cosmoline niche?: Listings span $14.22–$168.09; the average listing price is $74.08 (sweet spot $15–$100). The average incumbent carries 457 reviews — the moat a new listing must climb.